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Zhao X, Strzelecki AC, Dacheux N, Qi L, Guo X. Phonon softening induced phase transition of CeSiO 4: a density functional theory study. Dalton Trans 2024; 53:6224-6233. [PMID: 38488116 DOI: 10.1039/d4dt00179f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Density functional theory plus Hubbard U (DFT+U) methodology was used to calculate the structures and energetic landscapes of CeSiO4, including its stetindite and scheelite phases from ambient pressure to ∼24 GPa. To ensure accurate simulations of the high-pressure structures, assessments of strain-stress methods and stress-strain methods were conducted in prior, with the former found to have a better agreement with the experimental result. From DFT calculations the equation of states (EOS) of both stetindite and scheelite were further obtained, with the fitted bulk moduli being 182(2) GPa and 190.0(12) GPa, respectively. These results were found to be consistent with the experimental values of 177(5) GPa and 222(40) GPa. Furthermore, the calculated energetics suggest that the stetindite structure is more thermodynamically stable than the scheelite structure at a pressure lower than 8.35 GPa. However, the stetindite → scheelite phase transition was observed experimentally at a much higher pressure of ∼15 GPa. A further phonon spectra investigation by the density functional perturbation theory (DFPT) indicated the Eg1 mode is being softened with pressure and becomes imaginary after 12 GPa, which is a sign of the lattice instability. Consequently, it was concluded that the stetindite → scheelite transition is predominantly initiated by the lattice instability under high-pressure.
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Affiliation(s)
- Xiaodong Zhao
- Department of Chemistry, Washington State University, Pullman, Washington, 99164, USA.
| | - Andrew C Strzelecki
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, 99164, USA
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols sur Cèze, 30207, France
| | - Liang Qi
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan, 48109, USA.
| | - Xiaofeng Guo
- Department of Chemistry, Washington State University, Pullman, Washington, 99164, USA.
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, 99164, USA
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El Monjid A, Szenknect S, Mesbah A, Hunault MOJY, Menut D, Clavier N, Dacheux N. Incorporation of U(IV) in monazite-cheralite ceramics under oxidizing and inert atmospheres. Dalton Trans 2024; 53:2252-2264. [PMID: 38193888 DOI: 10.1039/d3dt03251e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
This work is the first attempt to prepare Nd1-xCaxUxPO4 monazite-cheralite with 0 < x ≤ 0.1 by a wet chemistry method. This method relies on the precipitation under hydrothermal conditions (T = 110 °C for four days) of the Nd1-xCaxUxPO4·nH2O rhabdophane precursor, followed by its thermal conversion for 6 h at 1100 °C in air or Ar atmosphere. The optimized synthesis protocol led to the incorporation of U and Ca in the rhabdophane structure. After heating at 1100 °C for 6 h in air, single-phase monazite-cheralite samples were obtained. However, α-UP2O7 was identified as a secondary minor phase in the samples heated under Ar atmosphere. The U speciation in the samples converted in an oxidising atmosphere was carefully characterized using synchrotron radiation by combining HERFD-XANES and XRD. These results showed the presence of a minor secondary phase containing hexavalent uranium and phosphate with a stoichiometry of U : P = 0.78. This highly labile uranyl phosphate phase incorporated 21 mol% of the uranium initially precipitated with the rhabdophane precursor. This phase was completely removed by a washing protocol. Thus, single-phase monazite-cheralite was obtained through the wet chemistry route described in this work with a maximum U loading of x = 0.08.
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Affiliation(s)
- Alison El Monjid
- ICSM, Univ. Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols/Cèze, France.
| | - Stéphanie Szenknect
- ICSM, Univ. Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols/Cèze, France.
| | - Adel Mesbah
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626 Villeurbanne, France
| | | | - Denis Menut
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - Nicolas Clavier
- ICSM, Univ. Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols/Cèze, France.
| | - Nicolas Dacheux
- ICSM, Univ. Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols/Cèze, France.
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3
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Sirven JB, Szenknect S, Vors E, Anzalone E, Benarib S, Sarr PM, Reiller PE, Mesbah A, Dacheux N, Vercouter T, Descostes M. Time-resolved laser-induced fluorescence spectroscopy and chemometrics for fast identification of U(VI)-bearing minerals in a mining context. Spectrochim Acta A Mol Biomol Spectrosc 2023; 296:122671. [PMID: 37031480 DOI: 10.1016/j.saa.2023.122671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/16/2023] [Accepted: 03/23/2023] [Indexed: 06/19/2023]
Abstract
We evaluated the potential of time-resolved laser-induced fluorescence spectroscopy (TRLFS) combined with chemometric methods for fast identification of U(VI)-bearing minerals in a mining context. We analyzed a sample set which was representative of several environmental conditions. The set consisted of 80 uranium-bearing samples related to mining operations, including natural minerals, minerals with uranium sorbed on the surface, and synthetic phases prepared and characterized specifically for this study. The TRLF spectra were processed using the Ward algorithm and the K-nearest neighbors (KNN) method to reveal similarities between samples and to rapidly identify the uranium-bearing phase and the associated mineralogical family. The predictive models were validated on an independent dataset, and then applied to test samples mostly taken from U mill tailings. Identification results were found to be in accordance with the available characterization data from X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDX). This work shows that TRLFS can be an effective decision-making tool for environmental investigations or geological prospection, considering the large diversity of uranium-bearing mineral phases and their low concentration in environmental samples.
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Affiliation(s)
- Jean-Baptiste Sirven
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette, France.
| | - Stéphanie Szenknect
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France
| | - Evelyne Vors
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette, France
| | - Eddie Anzalone
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France
| | - Sofian Benarib
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France
| | - Papa-Masserigne Sarr
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette, France
| | - Pascal E Reiller
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette, France
| | - Adel Mesbah
- IRCELYON, CNRS - UCBL, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France
| | - Thomas Vercouter
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette, France
| | - Michaël Descostes
- ORANO Mining, Environmental R&D Dpt, 125 avenue de Paris, 92320 Chatillon, France; Centre de Géosciences, MINES Paris, PSL Research University, Paris, France
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Benarib S, Dacheux N, Le Goff XF, Lautru J, Di Mascio L, Clavier N. Hydrothermal conversion of mixed uranium(IV)-cerium(III) oxalates into U 1-xCe xO 2+δ· nH 2O solid solutions. Dalton Trans 2023. [PMID: 37490297 DOI: 10.1039/d3dt01510f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
Uranium-cerium oxide solid solutions, U1-xCexO2+δ·nH2O, were prepared through hydrothermal conversion of mixed U(IV)-Ce(III) oxalate precursors, cerium being used as a surrogate for plutonium. Whatever the starting pH, the fluorite-type structure of AnO2 was obtained after heating at 250 °C for 24 h. The initial pH of the reaction media appeared to affect significantly the oxide morphology: for pH ≤ 2, the powder was found to be composed of microspheres, whereas for more alkaline pH values, agglomerates of nanocrystallites were found. Furthermore, a study of the hydrothermal treatment duration (T = 250 °C, pH = 8, t = 1-48 h) showed that fluorite-type mixed dioxides started to form after only 1 h, and then became single phase after 3 h. SEM and TEM/EDS analyses revealed that the cationic distribution narrowed with time to finally form highly homogeneous mixed oxides. Such a preparation route was then applied to various cerium incorporation rates and it was found that the formation of U1-xCexO2+δ·nH2O mixed oxides was possible for 0.1 ≤ x ≤ 0.75. In all the systems investigated, the speciation of uranium and cerium was questioned in both the solid and liquid phases. Thermodynamic calculations and evaluation of the O/M ratio in the final oxides led us to understand the complex redox behaviour of uranium and cerium in solution during hydrothermal processes and to propose a conversion mechanism.
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Affiliation(s)
- S Benarib
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - N Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - X F Le Goff
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - J Lautru
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - L Di Mascio
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - N Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
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Barral T, Estevenon P, Chanteau Y, Kaczmarek T, Strzelecki AC, Menut D, Welcomme E, Szenknect S, Moisy P, Guo X, Dacheux N. How hydrothermal synthesis improves the synthesis of (Zr,Ce)SiO 4 solid solutions. Dalton Trans 2023. [PMID: 37408368 DOI: 10.1039/d3dt01524f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/07/2023]
Abstract
Although ZrSiO4 is the most well-known compound in the zircon-structured family (space group I41/amd), the experimental conditions for preparing pure and well-crystallized phases that are doped with a tetravalent element via hydrothermal synthesis have never been clearly discussed in the literature. With the aim to answer this question, the experimental conditions of the preparation of ZrSiO4 and (Zr,Ce)SiO4 were investigated in order to synthesize well-crystallized and pure phases. A multiparametric study has been carried out using soft hydrothermal conditions with variables including reactant concentration, initial pH of the reactive medium, and duration of the hydrothermal treatment. Pure ZrSiO4 was obtained through hydrothermal treatment for 7 days at 250 °C, within a large acidity range (1.0 ≤ pH ≤ 9.0) and starting from CSi ≈ CZr ≥ 0.2 mol L-1. As hydrothermally prepared zircon structured phases can be both hydrated and hydroxylated, its annealed form was also studied after heating to 1000 °C. Based on these results, the synthesis of (Zr,Ce)SiO4 solid solutions was also investigated. The optimal hydrothermal conditions to acquire pure and crystallized phases were as follows: 7 days at 250 °C with initial pH = 1 and concentration of the reactants equal to 0.2 mol L-1. This led to Zr1-xCexSiO4 solid solutions with the incorporated Ce content up to 40 mol%. Samples were characterized using multiple methods, including laboratory and synchrotron PXRD, IR and Raman spectroscopies, SEM, and TGA. Moreover, it was found that these phases were thermally stable in air up to at least 1000 °C.
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Affiliation(s)
- Thomas Barral
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
| | - Paul Estevenon
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Yann Chanteau
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
| | - Thibault Kaczmarek
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Andrew C Strzelecki
- Department of Chemistry, Washington State University, Pullman, Washington 99164, USA
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USA
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
| | - Denis Menut
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint Aubin, France
| | | | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Xiaofeng Guo
- Department of Chemistry, Washington State University, Pullman, Washington 99164, USA
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USA
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
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Massonnet M, Claparede L, Martinez J, Martin PM, Hunault MOJY, Prieur D, Mesbah A, Dacheux N, Clavier N. Influence of Sintering Conditions on the Structure and Redox Speciation of Homogeneous (U,Ce)O 2+δ Ceramics: A Synchrotron Study. Inorg Chem 2023; 62:7173-7185. [PMID: 37133506 DOI: 10.1021/acs.inorgchem.2c03945] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Although uranium-cerium dioxides are frequently used as a surrogate material for (U,Pu)O2-δ nuclear fuels, there is currently no reliable data regarding the oxygen stoichiometry and redox speciation of the cations in such samples. In order to fill this gap, this manuscript details a synchrotron study of highly homogeneous (U,Ce)O2±δ sintered samples prepared by a wet-chemistry route. HERFD-XANES spectroscopy led to determining accurately the O/M ratios (with M = U + Ce). Under a reducing atmosphere (pO2 ≈ 6 × 10-29 atm at 650 °C), the oxides were found to be close to O/M = 2.00, while the O/M ratio varied with the sintering conditions under argon (pO2 ≈ 3 × 10-6 atm at 650 °C). They globally appeared to be hyperstoichiometric (i.e., O/M > 2.00) with the departure from the dioxide stoichiometry decreasing with both the cerium content in the sample and the sintering temperature. Nevertheless, such a deviation from the ideal O/M = 2.00 ratio was found to generate only moderate structural disorder from EXAFS data at the U-L3 edge as all the samples retained the fluorite-type structure of the UO2 and CeO2 parent compounds. The determination of accurate lattice parameters owing to S-PXRD measurements led to complementing the data reported in the literature by various authors. These data were consistent with an empirical relation linking the unit cell parameter, the chemical composition, and the O/M stoichiometry, showing that the latter can be evaluated simply within a ± 0.02 uncertainty.
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Affiliation(s)
- Malvina Massonnet
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze 30207, France
| | - Laurent Claparede
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze 30207, France
| | - Julien Martinez
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, Bagnols-sur-Ceze 30207, France
| | - Philippe M Martin
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, Bagnols-sur-Ceze 30207, France
| | | | - Damien Prieur
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), 01314 Dresden, Germany
- The Rossendorf Beamline at ESRF - The European Synchrotron, 38043 Grenoble Cedex 9, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze 30207, France
- CNRS, IRCELYON, Univ Lyon, Université Claude Bernard Lyon 1, 69626 Villeurbanne, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze 30207, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze 30207, France
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Rafiuddin MR, Guo S, Donato G, Grosvenor AP, Dacheux N, Cava RJ, Mesbah A. Structural and magnetic properties of churchite-type REPO4·2H2O materials. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Estevenon P, Dumas T, Solari PL, Welcomme E, Szenknect S, Mesbah A, Kvashnina KO, Moisy P, Poinssot C, Dacheux N. Correction: Formation of plutonium(IV) silicate species in very alkaline reactive media. Dalton Trans 2022; 51:6976-6977. [PMID: 35383801 PMCID: PMC9063192 DOI: 10.1039/d2dt90053j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Correction for ‘Formation of plutonium(iv) silicate species in very alkaline reactive media’ by Paul Estevenon et al., Dalton Trans., 2021, 50, 12528–12536, DOI: 10.1039/D1DT02248B.
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Affiliation(s)
- Paul Estevenon
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France. .,ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France. .,The Rossendorf Beamline at the ESRF, CS40220, 38043 Grenoble Cedex 9, France.,Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, P.O. Box 510119, 01314, Dresden, Germany
| | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France.
| | - Pier Lorenzo Solari
- Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | | | | | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
| | - Kristina O Kvashnina
- The Rossendorf Beamline at the ESRF, CS40220, 38043 Grenoble Cedex 9, France.,Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, P.O. Box 510119, 01314, Dresden, Germany
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France.
| | | | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
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Estevenon P, Dumas T, Solari PL, Welcomme E, Szenknect S, Mesbah A, Kvashnina KO, Moisy P, Poinssot C, Dacheux N. Formation of plutonium(IV) silicate species in very alkaline reactive media. Dalton Trans 2021; 50:12528-12536. [PMID: 34545888 DOI: 10.1039/d1dt02248b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Studying the speciation of Pu(IV) in very alkaline and silicate ion rich reactive media allowed identification of the formation of plutonium(IV)-silicate colloidal suspensions which were stable for months. These colloids were stabilized in aqueous solution for pH > 13 and for concentrations around 10-2 mol L-1. Successive filtration processes allowed evaluation of their size, which was found to be smaller than 6 nm. Their structural characterization by XAS evidenced that their structure was similar to those identified for the other tetravalent actinide-silicate colloidal systems like thorium, uranium and neptunium. Their formation could explain the increase of plutonium solubility usually observed in alkaline silicate-rich solutions and could affect the plutonium mobility as a result in contaminated sites or in other environmental permeable media.
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Affiliation(s)
- Paul Estevenon
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France. .,ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France. .,The Rossendorf Beamline at the ESRF, CS40220, 38043 Grenoble Cedex 9, France.,Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, P.O. Box 510119, 01314, Dresden, Germany
| | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France.
| | - Pier Lorenzo Solari
- Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | | | | | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
| | - Kristina O Kvashnina
- The Rossendorf Beamline at the ESRF, CS40220, 38043 Grenoble Cedex 9, France.,Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, P.O. Box 510119, 01314, Dresden, Germany
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France.
| | | | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
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10
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Shelyug A, Rafiuddin MR, Mesbah A, Clavier N, Szenknect S, Dacheux N, Guo X, Navrotsky A. Effect of Annealing on Structural and Thermodynamic Properties of ThSiO 4-ErPO 4 Xenotime Solid Solution. Inorg Chem 2021; 60:12020-12028. [PMID: 34328730 DOI: 10.1021/acs.inorgchem.1c01137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of annealing on structural and thermochemical properties of a thorite-xenotime solid solution Th1-xErx(SiO4)1-x(PO4)x was assessed. The samples synthesized at low temperatures and stored at room temperature for 2 years retained their tetragonal structures. This structure was also maintained after heating to 1100 °C. During annealing, the structure lost water and exsolved some thorianite phases. The thermodynamic parameters did not change much after annealing, suggesting that xenotime was not a low-temperature metastable phase but rather a stable structure able to withstand elevated temperatures regardless of the thorium content. The solid solution exhibited subregular behavior with the Margules function W(x) = (73.1 ± 20.1) - (125.7 ± 49.8)·x.
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Affiliation(s)
- Anna Shelyug
- Institute of Solid State Chemistry, Yekaterinburg 620990, Russia
| | | | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze 30207, France.,Institut de Recherches sur la Catalyse et l'Environnement de Lyon, IRCELYON, UMR5256, CNRS, Univ Lyon, Université Lyon 1, 2 Avenue Albert Einstein, Villeurbanne Cedex 69626, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze 30207, France
| | - Stéphanie Szenknect
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze 30207, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze 30207, France
| | - Xiaofeng Guo
- Department of Chemistry and Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States
| | - Alexandra Navrotsky
- School of Molecular Sciences a Center for Materials of the Universe, Arizona State University, Tempe, Arizona 85287, United States
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Podor R, Trillaud V, Nkou Bouala GI, Dacheux N, Ricolleau C, Clavier N. A multiscale in situ high temperature high resolution transmission electron microscopy study of ThO 2 sintering. Nanoscale 2021; 13:7362-7374. [PMID: 33889920 DOI: 10.1039/d1nr00956g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two-grain model systems formed by ThO2 nanospheres have been used to experimentally study for the first time the initial stage of sintering from room temperature to 1050 °C using high temperature high resolution transmission electron microscopy. In each grain, oriented attachment drove the reorganization and growth of the crystallites up to 300 °C to form a pseudo single crystal. Crystallite size kept growing up to 950 °C. At this temperature, a fast transformation probably corresponding to the elimination of stacking faults or dislocation walls led to the formation of single-crystals. The contact formed at room temperature between the two grains was stabilized during heat treatment by a slight reorientation of the crystallographic planes (T≈ 400 °C), leading the neck to be formed by numerous boundaries between the crystallites. At higher temperatures, the neck evolved and stabilized in the form of a plane of crystallographic orientation mismatch between the grains, which corresponds to the usual definition of the grain boundary. The growth of the neck by the addition of atomic columns was further observed in real time and quantified. At T = 950 °C, the evolution of the microscopic sintering parameter λ was obtained from HT-HRTEM images and indicated that the neck formation mostly proceeded through volume diffusion.
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Affiliation(s)
- R Podor
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
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12
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Strzelecki AC, Barral T, Estevenon P, Mesbah A, Goncharov V, Baker J, Bai J, Clavier N, Szenknect S, Migdisov A, Xu H, Ewing RC, Dacheux N, Guo X. The Role of Water and Hydroxyl Groups in the Structures of Stetindite and Coffinite, MSiO 4 (M = Ce, U). Inorg Chem 2021; 60:718-735. [PMID: 33393766 DOI: 10.1021/acs.inorgchem.0c02757] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Orthosilicates adopt the zircon structure types (I41/amd), consisting of isolated SiO4 tetrahedra joined by A-site metal cations, such as Ce and U. They are of significant interest in the fields of geochemistry, mineralogy, nuclear waste form development, and material science. Stetindite (CeSiO4) and coffinite (USiO4) can be formed under hydrothermal conditions despite both being thermodynamically metastable. Water has been hypothesized to play a significant role in stabilizing and forming these orthosilicate phases, though little experimental evidence exists. To understand the effects of hydration or hydroxylation on these orthosilicates, in situ high-temperature synchrotron and laboratory-based X-ray diffraction was conducted from 25 to ∼850 °C. Stetindite maintains its I41/amd symmetry with increasing temperature but exhibits a discontinuous expansion along the a-axis during heating, presumably due to the removal of water confined in the [001] channels, which shrink against thermal expansion along the a-axis. Additional in situ high-temperature Raman and Fourier transform infrared spectroscopy also confirmed the presence of the confined water. Coffinite was also found to expand nonlinearly up to 600 °C and then thermally decompose into a mixture of UO2 and SiO2. A combination of dehydration and dehydroxylation is proposed for explaining the thermal behavior of coffinite synthesized hydrothermally. Additionally, we investigated high-temperature structures of two coffinite-thorite solid solutions, uranothorite (UxTh1-xSiO4), which displayed complex variations in composition during heating that was attributed to the negative enthalpy of mixing. Lastly, for the first time, the coefficients of thermal expansion of CeSiO4, USiO4, U0.46Th0.54SiO4, and U0.9Th0.1SiO4 were determined to be αV = 14.49 × 10-6, 14.29 × 10-6, 17.21 × 10-6, and 17.23 × 10-6 °C-1, respectively.
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Affiliation(s)
- Andrew C Strzelecki
- Department of Chemistry, Washington State University, Pullman 99164, Washington, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman 99164, Washington, United States.,Materials Science and Engineering Program, Washington State University, Pullman 99164, Washington, United States
| | - Thomas Barral
- Department of Chemistry, Washington State University, Pullman 99164, Washington, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman 99164, Washington, United States.,ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France
| | - Paul Estevenon
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France.,CEA, DES, ISEC, DMRC, Univ Montpellier, Site de Marcoule 30207, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France
| | - Vitaliy Goncharov
- Department of Chemistry, Washington State University, Pullman 99164, Washington, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman 99164, Washington, United States.,Materials Science and Engineering Program, Washington State University, Pullman 99164, Washington, United States.,Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos 87545, New Mexico, United States
| | - Jason Baker
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos 87545, New Mexico, United States
| | - Jianming Bai
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton 11973, New York, United States
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France
| | - Stephanie Szenknect
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France
| | - Artaches Migdisov
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos 87545, New Mexico, United States
| | - Hongwu Xu
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos 87545, New Mexico, United States
| | - Rodney C Ewing
- Department of Geological Sciences, Stanford University, Stanford 94305, California, United States
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule 30207, Bagnols sur Cèze, France
| | - Xiaofeng Guo
- Department of Chemistry, Washington State University, Pullman 99164, Washington, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman 99164, Washington, United States.,Materials Science and Engineering Program, Washington State University, Pullman 99164, Washington, United States
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13
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Manaud J, Maynadié J, Mesbah A, Hunault MOJY, Martin PM, Zunino M, Dacheux N, Clavier N. Hydrothermal Conversion of Thorium Oxalate into ThO 2· nH 2O Oxide. Inorg Chem 2020; 59:14954-14966. [PMID: 32996765 DOI: 10.1021/acs.inorgchem.0c01633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrothermal conversion of thorium oxalate, Th(C2O4)2·nH2O, into thorium dioxide was explored through a multiparametric study, leading to some guidelines for the preparation of crystallized samples with the minimum amount of impurities. As the formation of the oxide appeared to be operated through the hydrolysis of Th4+ after decomposition of oxalate fractions, pH values typically above 1 must be considered to recover a solid phase. Also, because of the high stability of the thorium oxalate precursor, hydrothermal treatments of more than 5 h at a temperature above 220 °C were required. All the ThO2·nH2O samples prepared presented amounts of residual carbon and water in the range 0.2-0.3 wt % and n ≈ 0.5, respectively. A combined FTIR, PXRD, and EXAFS study showed that these impurities mainly consisted of carbonates trapped between elementary nanosized crystallites, rather than substituted directly in the lattice, which generated a tensile effect over the crystal lattice. The presence of carbonates at the surface of the elementary crystallites could also explain their tendency to self-assembly, leading to the formation of spherical aggregates. Hydrothermal conversion of oxalates could then find its place in different processes of the nuclear fuel cycle, where it will provide an interesting opportunity to set up dustless routes leading from ions in solution to dioxide powders in a limited number of steps.
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Affiliation(s)
- Jérémie Manaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Jérôme Maynadié
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Myrtille O J Y Hunault
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif-sur-Yvette, France
| | | | - Morgan Zunino
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France
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Strzelecki AC, Bourgeois C, Kriegsman KW, Estevenon P, Wei N, Szenknect S, Mesbah A, Wu D, Ewing RC, Dacheux N, Guo X. Thermodynamics of CeSiO 4: Implications for Actinide Orthosilicates. Inorg Chem 2020; 59:13174-13183. [PMID: 32871073 DOI: 10.1021/acs.inorgchem.0c01476] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Zircon (ZrSiO4, I41/amd) can accommodate actinides, such as thorium, uranium, and plutonium. The zircon structure has been determined for several of the end-member compositions of other actinides, such as plutonium and neptunium. However, the thermodynamic properties of these actinide zircon structure types are largely unknown due to the difficulties in synthesizing these materials and handling transuranium actinides. Thus, we have completed a thermodynamic study of cerium orthosilicate, stetindite (CeSiO4), a surrogate of PuSiO4. For the first time, the standard enthalpy of formation of CeSiO4 was obtained by high temperature oxide melt solution calorimetry to be -1971.9 ± 3.6 kJ/mol. Stetindite is energetically metastable with respect to CeO2 and SiO2 by 27.5 ± 3.1 kJ/mol. The metastability explains the rarity of the natural occurrence of stetindite and the difficulty of its synthesis. Applying the obtained enthalpy of formation of CeSiO4 from this work, along with those previously reported for USiO4 and ThSiO4, we developed an empirical energetic relation for actinide orthosilicates. The predicted enthalpies of formation of AnSiO4 are then determined with a discussion of future strategies for efficiently immobilizing Pu or minor actinides in the zircon structure.
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Affiliation(s)
- Andrew C Strzelecki
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States.,Materials Science and Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Clement Bourgeois
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States
| | - Kyle W Kriegsman
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States
| | - Paul Estevenon
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols sur Cèze 30207, France.,CEA, DES, ISEC, DMRC, Univ Montpellier, Site de Marcoule 30207, France
| | - Nian Wei
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,College of Physical Science and Technology, Sichuan University, Chengdu 610065, People's Republic of China
| | - Stephanie Szenknect
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols sur Cèze 30207, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols sur Cèze 30207, France
| | - Di Wu
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States.,Materials Science and Engineering, Washington State University, Pullman, Washington 99164, United States.,The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
| | - Rodney C Ewing
- Department of Geological Sciences, Stanford University, Stanford, California 94305, United States
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols sur Cèze 30207, France
| | - Xiaofeng Guo
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.,Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, Washington 99164, United States.,Materials Science and Engineering, Washington State University, Pullman, Washington 99164, United States
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15
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Estevenon P, Causse J, Szenknect S, Welcomme E, Mesbah A, Moisy P, Poinssot C, Dacheux N. In situ study of the synthesis of thorite (ThSiO 4) under environmental representative conditions. Dalton Trans 2020; 49:11512-11521. [PMID: 32840279 DOI: 10.1039/d0dt01790f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Thorite, (ThSiO4) with a zircon type structure, is one of the most abundant natural sources of thorium on Earth. Generally, actinides are known to form nanoparticles in silicate medium, though no direct link between those colloids and the crystalline form of thorite was evidenced until now. Here we show the formation of thorite from colloids and nanocrystalline structures under experimental conditions close to environmental pH and temperature. Through in situ small and wide angle X-ray scattering (SWAXS) measurements, colloids with a few nanometers in size were first evidenced at a low reaction time. These colloids have elongated shapes and finally tend to aggregate after their size has reached 10 nm. Once aggregated, the system goes through a maturation step, ending with the emergence of nanocrystallites as thorite zircon structures. This maturation step is longer when the reaction temperature is decreased which highlights the kinetic considerations. These results have potential implications on the paragenesis of Th mineral deposits and also in the behaviour of Th and, by analogy, tetravalent actinides in the environment. The significant characteristics of this work are that Th-silicate colloids were demonstrated at low temperatures and a near neutral pH with long-term stability and a morphology in favor of high mobility in groundwater. If these species are formed in more diluted media, this could be problematic owing to the spreading of Th and, by analogy, other tetravalent actinides in the environment.
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Affiliation(s)
- Paul Estevenon
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France. and CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Jeremy Causse
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France.
| | | | | | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France.
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | | | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols-sur-Cèze, France.
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Szenknect S, Mesbah A, Descostes M, Maihatchi-Ahamed A, Bonato L, Massonnet M, Ziouane Y, Vors E, Vercouter T, Clavier N, Lautru J, Dacheux N. Uranium removal from mining water using Cu substituted hydroxyapatite. J Hazard Mater 2020; 392:122501. [PMID: 32208317 DOI: 10.1016/j.jhazmat.2020.122501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 02/25/2020] [Accepted: 03/08/2020] [Indexed: 06/10/2023]
Abstract
In this study, synthetic copper substituted hydroxyapatite (Cu-Hap), CuxCa10-x(PO4)6(OH)2 were prepared by co-precipitation method and were used as reactive materials in batch experiments to immobilize uranyl. The limit of incorporation of Cu into a single-phased Cu-Hap reached xCu ≤1.59. The synthetic Cu-Hap samples obtained with various Cu contents were contacted with synthetic uranyl doped solutions and with real mining waters showing various pH and chemical compositions. A fast and strong decrease of the uranium concentration was observed, followed by the establishment of an equilibrium after 1-4 days of contact with the solutions. Examination of the solid phase after uranium uptake was performed using a combination of techniques. Depending on the composition of the solution and the copper content of the Cu-Hap, various mechanisms of uranium removal were observed. Based on the experimental results and geochemical simulations, it appeared that the main interest for using Cu-Hap is to enlarge the domain of water compositions for which the precipitation of meta-torbernite, (H3O)0.4Cu0.8(UO2)2(PO4)2·7.6 H2O is the predominant mechanism associated to the uranium removal, especially for pH > 6.7 where carbonate uranium species are predominant.
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Affiliation(s)
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
| | - Michael Descostes
- ORANO Mines, R&D Dpt., 125 Avenue de Paris, 92330, Châtillon, France
| | | | - Laura Bonato
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
| | | | - Yannis Ziouane
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
| | - Evelyne Vors
- Den - Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191, Gif sur Yvette, France
| | - Thomas Vercouter
- Den - Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191, Gif sur Yvette, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
| | - Joseph Lautru
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France
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Estevenon P, Welcomme E, Tamain C, Jouan G, Szenknect S, Mesbah A, Poinssot C, Moisy P, Dacheux N. The formation of PuSiO 4 under hydrothermal conditions. Dalton Trans 2020; 49:6434-6445. [PMID: 32355939 DOI: 10.1039/d0dt01183e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Attempts to synthesize plutonium(iv) silicate, PuSiO4, have been made on the basis of results recently reported in the literature for CeSiO4, ThSiO4, and USiO4 under hydrothermal conditions. Although it was not possible to prepare PuSiO4via applying the conditions reported for thorium and uranium, an efficient method of PuSiO4 synthesis was established by applying the conditions optimized for the CeSiO4 system. This method was based on the slow oxidation of plutonium(iii) silicate reactants under hydrothermal conditions at 150 °C in hydrochloric acid (pH = 3-4). These results shed new light on the potential behavior of plutonium in reductive environments, highlighting the representative nature of cerium surrogates when studying plutonium under such conditions and providing some important pieces of information regarding plutonium chemistry in silicate solutions.
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Affiliation(s)
- Paul Estevenon
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France and ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France.
| | | | | | - Gauthier Jouan
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Stephanie Szenknect
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France.
| | - Adel Mesbah
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France.
| | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Site de Marcoule, Bagnols-sur-Cèze, France.
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Qin D, Mesbah A, Lautru J, Szenknect S, Dacheux N, Clavier N. Reaction sintering of rhabdophane into monazite-cheralite Nd1-2xThxCaxPO4 (x = 0 – 0.1) ceramics. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2019.10.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Manaud J, Maynadié J, Mesbah A, Hunault MOJY, Martin PM, Zunino M, Meyer D, Dacheux N, Clavier N. Hydrothermal Conversion of Uranium(IV) Oxalate into Oxides: A Comprehensive Study. Inorg Chem 2020; 59:3260-3273. [DOI: 10.1021/acs.inorgchem.9b03672] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jérémie Manaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Jérôme Maynadié
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | | | - Philippe M. Martin
- CEA, DEN, DMRC, Universite Montpellier, Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Morgan Zunino
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Daniel Meyer
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Clavier
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
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Bonato L, Virot M, Dumas T, Mesbah A, Dalodière E, Dieste Blanco O, Wiss T, Le Goff X, Odorico M, Prieur D, Rossberg A, Venault L, Dacheux N, Moisy P, Nikitenko SI. Probing the local structure of nanoscale actinide oxides: a comparison between PuO 2 and ThO 2 nanoparticles rules out PuO 2+x hypothesis. Nanoscale Adv 2020; 2:214-224. [PMID: 36134012 PMCID: PMC9418969 DOI: 10.1039/c9na00662a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/26/2019] [Indexed: 06/01/2023]
Abstract
Actinide research at the nanoscale is gaining fundamental interest due to environmental and industrial issues. The knowledge of the local structure and speciation of actinide nanoparticles, which possibly exhibit specific physico-chemical properties in comparison to bulk materials, would help in a better and reliable description of their behaviour and reactivity. Herein, the synthesis and relevant characterization of PuO2 and ThO2 nanoparticles displayed as dispersed colloids, nanopowders, or nanostructured oxide powders allow to establish a clear relationship between the size of the nanocrystals constituting these oxides and their corresponding An(iv) local structure investigated by EXAFS spectroscopy. Particularly, the first oxygen shell of the probed An(iv) evidences an analogous behaviour for both Pu and Th oxides. This observation suggests that the often observed and controversial splitting of the Pu-O shell on the Fourier transformed EXAFS signal of the PuO2 samples is attributed to a local structural disorder driven by a nanoparticle surface effect rather than to the presence of PuO2+x species.
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Affiliation(s)
- Laura Bonato
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Matthieu Virot
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Thomas Dumas
- CEA, DEN, DMRC, Univ Montpellier Marcoule France
| | - Adel Mesbah
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Oliver Dieste Blanco
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU) Postfach 2340 76125 Karlsruhe Germany
| | - Thierry Wiss
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU) Postfach 2340 76125 Karlsruhe Germany
| | - Xavier Le Goff
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Damien Prieur
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology Bautzner Landstraße 400 01328 Dresden Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology Bautzner Landstraße 400 01328 Dresden Germany
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21
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Aupiais J, Alexandre JC, Sicre R, Siberchicot B, Topin S, Moisy P, Dacheux N. The NpV
and PuV
Carbonate Systems: Thermodynamics and Coordination Chemistry. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Jean-Charles Alexandre
- CEA, DAM, DIF; 91297 Arpajon France
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM; Site de Marcoule 30207 Bagnols sur Cèze France
| | | | | | | | | | - Nicolas Dacheux
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM; Site de Marcoule 30207 Bagnols sur Cèze France
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22
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Bonato L, Virot M, Dumas T, Mesbah A, Lecante P, Prieur D, Le Goff X, Hennig C, Dacheux N, Moisy P, Nikitenko SI. Frontispiece: Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate. Chemistry 2019. [DOI: 10.1002/chem.201984163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Laura Bonato
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
| | - Matthieu Virot
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
| | - Thomas Dumas
- Department of Mining and Fuel Recycling Processes (DMRC), Site de MarcouleAtomic and Alternative Energies Commission (CEA), Nuclear Energy Division, BP17171 30207 Bagnols sur Cèze France
| | - Adel Mesbah
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
| | - Pierre Lecante
- Groupe SINanOCEMES-CNRS 29 rue Jeanne Marvig 31055 Toulouse Cedex 4 France
| | - Damien Prieur
- Institute of Resource EcologyHelmholtz-Zentrum Dresden–Rossendorf Bautzner Landstraße 400 01328 Dresden Germany
| | - Xavier Le Goff
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
| | - Christoph Hennig
- Institute of Resource EcologyHelmholtz-Zentrum Dresden–Rossendorf Bautzner Landstraße 400 01328 Dresden Germany
| | - Nicolas Dacheux
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
| | - Philippe Moisy
- Department of Mining and Fuel Recycling Processes (DMRC), Site de MarcouleAtomic and Alternative Energies Commission (CEA), Nuclear Energy Division, BP17171 30207 Bagnols sur Cèze France
| | - Sergey I. Nikitenko
- ICSMCEACNRSENSCMUniversité Montpellier, Site de Marcoule, Bat 426 30207 Bagnols sur Ceze France
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23
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Bonato L, Virot M, Dumas T, Mesbah A, Lecante P, Prieur D, Le Goff X, Hennig C, Dacheux N, Moisy P, Nikitenko SI. Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate. Chemistry 2019; 25:9580-9585. [PMID: 31070817 DOI: 10.1002/chem.201901426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Indexed: 11/11/2022]
Abstract
The preparation and structural characterization of an original Th peroxo sulfate dihydrate, crystallizing at room temperature in the form of stable 1D polymeric microfibres is described. A combination of laboratory and synchrotron techniques allowed solution of the structure of the Th(O2 )(SO4 )(H2 O)2 compound, which crystallizes in a new structure type in the space group Pna21 of the orthorhombic crystal system. Particularly, the peroxide ligand coordinates to the Th cations in an unusual μ3 -η2 :η2 :η2 bridging mode, forming an infinite 1D chain decorated with sulfato ligands exhibiting simultaneously monodentate and bidentate coordination modes.
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Affiliation(s)
- Laura Bonato
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
| | - Matthieu Virot
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
| | - Thomas Dumas
- Department of Mining and Fuel Recycling Processes (DMRC), Site de Marcoule, Atomic and Alternative Energies Commission (CEA), Nuclear Energy Division, BP17171, 30207, Bagnols sur Cèze, France
| | - Adel Mesbah
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
| | - Pierre Lecante
- Groupe SINanO, CEMES-CNRS, 29 rue Jeanne Marvig, 31055, Toulouse Cedex 4, France
| | - Damien Prieur
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Xavier Le Goff
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
| | - Christoph Hennig
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
| | - Philippe Moisy
- Department of Mining and Fuel Recycling Processes (DMRC), Site de Marcoule, Atomic and Alternative Energies Commission (CEA), Nuclear Energy Division, BP17171, 30207, Bagnols sur Cèze, France
| | - Sergey I Nikitenko
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Site de Marcoule, Bat 426, 30207, Bagnols sur Ceze, France
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24
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Estevenon P, Welcomme E, Szenknect S, Mesbah A, Moisy P, Poinssot C, Dacheux N. Preparation of CeSiO 4 from aqueous precursors under soft hydrothermal conditions. Dalton Trans 2019; 48:7551-7559. [PMID: 31119248 DOI: 10.1039/c9dt01258c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Even though CeSiO4 was synthesized one time through a hydrothermal treatment, the conditions leading to its formation remain largely unknown. In order to define the optimized conditions of synthesis, a multiparametric study was developed by varying the pH of the solution, the temperature, and the nature of the reactants and of the complexing ions in solution. This study highlighted that CeSiO4 could not be obtained starting from Ce(iv) reactants. An optimal set of conditions was defined to prepare single phase samples. Pure CeSiO4 was obtained through a hydrothermal treatment at 150 °C using a starting mixture of 1 mol L-1 Ce(iii) nitrate and Na2SiO3 solutions and by adjusting the initial pH to 8. The chemical limitations observed during the synthesis of CeSiO4 suggested that the formation of this phase may result from the slow in situ oxidation of a Ce(iii) silicate complex during the hydrothermal treatment.
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Affiliation(s)
- Paul Estevenon
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
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25
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Ronzani AL, Hubert A, Pointurier F, Marie O, Clavier N, Humbert AC, Aupiais J, Dacheux N. Determination of the isotopic composition of single sub-micrometer-sized uranium particles by laser ablation coupled with multi-collector inductively coupled plasma mass spectrometry. Rapid Commun Mass Spectrom 2019; 33:419-428. [PMID: 30496616 DOI: 10.1002/rcm.8366] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 11/13/2018] [Accepted: 11/27/2018] [Indexed: 06/09/2023]
Abstract
RATIONALE A multi-collector inductively coupled plasma (MC-ICP) mass spectrometer coupled to a UV ns-laser ablation (LA) system was used to measure uranium isotopic ratios (234 U/238 U, 235 U/238 U and 236 U/238 U) in single uranium particles of various sizes and isotopic compositions, including home-made sub-micrometric natural uranium particles of narrow size distribution (415 ± 60 nm). METHODS The LA-ICP mass spectrometer was operated in wet plasma conditions thanks to simultaneous injection of the laser aerosol and water vapor through a desolvating nebulizer. The isotopic ratios were corrected for mass bias and gain factors between detectors. The 236 U/238 U ratios were also corrected for the presence of 235 U hydrides and tailing of the 238 U+ peak. RESULTS 236 U/238 U ratios were successfully measured in micrometer-sized particles from the NBS U050 certified standard material with a 236 U/238 U ratio of ~5 × 10-4 . The analysis of 77 natural uranium sub-μm-sized particles yielded a very good trueness with respect to the expected 234 U/238 U and 235 U/238 U ratios, while the measurement errors for single particles ranged from -2.7% to +2.1% for 235 U/238 U and from -17% to +33% for the 234 U/238 U ratios. Their relative combined standard uncertainties ranged from 3.3% to 32.8% and from 0.4% to 4.0% for 234 U/238 U and 235 U/238 U ratios, respectively. In addition, extremely low detection limits, in the attogram range, were achieved. CONCLUSIONS This study demonstrates that coupling of a ns-laser ablation system with a MC-ICP mass spectrometer allows measurements of the isotopic composition in natural uranium particles of a few hundreds of nm with very good trueness, average combined standard uncertainties of ~1% for 235 U/238 U ratios and 12% for 234 U/238 U ratios, and detections limits of a few ag for minor isotopes.
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Affiliation(s)
- Anne-Laure Ronzani
- CEA, DAM, DIF, 91297, Arpajon, France
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bat 426, Site de Marcoule, BP 17171, 30207, Bagnols-sur-Cèze, France
| | | | | | | | - Nicolas Clavier
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bat 426, Site de Marcoule, BP 17171, 30207, Bagnols-sur-Cèze, France
| | | | | | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bat 426, Site de Marcoule, BP 17171, 30207, Bagnols-sur-Cèze, France
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26
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Shelyug A, Mesbah A, Szenknect S, Clavier N, Dacheux N, Navrotsky A. Thermodynamics and Stability of Rhabdophanes, Hydrated Rare Earth Phosphates REPO 4 · n H 2O. Front Chem 2019; 6:604. [PMID: 30619814 PMCID: PMC6304437 DOI: 10.3389/fchem.2018.00604] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 11/26/2018] [Indexed: 11/13/2022] Open
Abstract
Rare earth phosphates comprise a large family of compounds proposed as possible nuclear waste disposal forms. We report structural and thermodynamic properties of a series of rare earth rhabdophanes and monazites. The water content of the rhabdophanes, including both adsorbed and structural water, decreases linearly with increase in ionic radius of the rare earth. The energetics of the transformation of rhabdophane to monazite plus water and the enthalpy of formation of rhabdophane from the constituent oxides was determined by high temperature drop solution calorimetry. The former varies linearly with the ionic radius of the lanthanide, except for cerium. By combining the enthalpy of formation determined by high temperature drop solution calorimetry and the free energy of formation determined previously by solubility experiments, a complete set of thermodynamic data was derived for the rhabdophanes. They are thermodynamically metastable with respect to the corresponding monazites plus water at all temperatures under ambient pressure conditions. This conclusion strengthens the case for monazites being an excellent nuclear waste form.
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Affiliation(s)
- Anna Shelyug
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, Davis, CA, United States
| | - Adel Mesbah
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France
| | | | - Nicolas Clavier
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France
| | - Alexandra Navrotsky
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, Davis, CA, United States
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27
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Estevenon P, Kaczmarek T, Vadot F, Dumas T, Solari PL, Welcomme E, Szenknect S, Mesbah A, Moisy P, Poinssot C, Dacheux N. Formation of CeSiO 4 from cerium(iii) silicate precursors. Dalton Trans 2019; 48:10455-10463. [PMID: 31241109 DOI: 10.1039/c9dt01990a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although the preparation of CeSiO4 has been already reported, the formation of pure cerium silicate from aqueous precursors appears as a challenge. An innovative way of synthesis has been identified in this study, allowing the formation of CeSiO4 after hydrothermal treatment starting from Ce(iii) silicate precursors. Among the experimental parameters examined, significant effects were found according to the nature of the precursor and of the reactive media considered, the pH of the reactive media and the temperature of the hydrothermal process. This study allows the determination of optimized conditions for the hydrothermal synthesis of pure CeSiO4 (A-Ce2Si2O7 or Ce4.67(SiO4)3O as starting precursors, nitric medium, pH = 7, 7 days at 150 °C). The in situ low oxidation rate of Ce(iii) into Ce(iv) was a key parameter to consider in order to avoid the presence of CeO2 in the final mixtures.
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Affiliation(s)
- Paul Estevenon
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France and ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
| | - Thibault Kaczmarek
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France and ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
| | - Fabien Vadot
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France and ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
| | - Thomas Dumas
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Pier Lorenzo Solari
- Synchrotron SOLEIL L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Eleonore Welcomme
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Stephanie Szenknect
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
| | - Adel Mesbah
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
| | - Philippe Moisy
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Christophe Poinssot
- CEA, Nuclear Energy Division, CEA Marcoule Research Department of Mining and Fuel Recycling Processes, DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
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28
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Clavier N, Mesbah A, Szenknect S, Dacheux N. Monazite, rhabdophane, xenotime & churchite: Vibrational spectroscopy of gadolinium phosphate polymorphs. Spectrochim Acta A Mol Biomol Spectrosc 2018; 205:85-94. [PMID: 30015033 DOI: 10.1016/j.saa.2018.07.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
Rare-earth phosphates with the general formula REEPO4·nH2O belong to four distinct structural types: monazite, rhabdophane, churchite, and xenotime. We report herein the first direct comparison between vibrational spectra of these compounds for the same metal cation i.e. gadolinium. The four GdPO4·nH2O samples were prepared through wet chemistry methods and first characterized by X-ray diffraction. Three distinct spectral domains, associated to the deformation and stretching modes of phosphate tetrahedra (PO4) and to water molecules vibrations were then analyzed from FTIR and Raman data, and discussed regarding the structural characteristics of each sample. The most obvious differences between the spectra were associated to δ(H2O) and δs(PO4) modes and led to propose a simple method to rapidly and unambiguously discriminate the four polymorphs.
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Affiliation(s)
- N Clavier
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze cedex, France.
| | - A Mesbah
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - S Szenknect
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - N Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze cedex, France
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29
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Estevenon P, Welcomme E, Szenknect S, Mesbah A, Moisy P, Poinssot C, Dacheux N. Impact of Carbonate Ions on the Synthesis of ThSiO4 under Hydrothermal Conditions. Inorg Chem 2018; 57:12398-12408. [DOI: 10.1021/acs.inorgchem.8b02146] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Paul Estevenon
- CEA, Nuclear Energy Division, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, CEA Marcoule, BP 17171, 30207 Bagnols-sur-Cèze, France
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, Bât.
426, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Eleonore Welcomme
- CEA, Nuclear Energy Division, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, CEA Marcoule, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Stephanie Szenknect
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, Bât.
426, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, Bât.
426, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Philippe Moisy
- CEA, Nuclear Energy Division, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, CEA Marcoule, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Christophe Poinssot
- CEA, Nuclear Energy Division, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, CEA Marcoule, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, Bât.
426, BP 17171, 30207 Bagnols-sur-Cèze, France
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30
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Mesbah A, Clavier N, Szenknect S, Dacheux N. The intriguing crystal structure of the rhabdophane mineral LnPO 4· nH 2O. Acta Crystallogr A Found Adv 2018. [DOI: 10.1107/s0108767318099622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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31
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Estevenon P, Welcomme E, Szenknect S, Mesbah A, Moisy P, Poinssot C, Dacheux N. Multiparametric Study of the Synthesis of ThSiO4 under Hydrothermal Conditions. Inorg Chem 2018; 57:9393-9402. [DOI: 10.1021/acs.inorgchem.8b01390] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul Estevenon
- CEA, Nuclear Energy Division, CEA Marcoule, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Eleonore Welcomme
- CEA, Nuclear Energy Division, CEA Marcoule, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Stephanie Szenknect
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule,
Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Adel Mesbah
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule,
Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Philippe Moisy
- CEA, Nuclear Energy Division, CEA Marcoule, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Christophe Poinssot
- CEA, Nuclear Energy Division, CEA Marcoule, Research Department of Mining and Fuel Recycling Processes, DEN/DMRC, BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule,
Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France
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32
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Alexandre JC, Dacheux N, Aupiais J. Determination of the stability constants of Pu(VI) carbonate complexes by capillary electrophoresis coupled with inductively coupled plasma mass spectrometer. RADIOCHIM ACTA 2018. [DOI: 10.1515/ract-2018-2929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
New determination of the stability constants related to the Pu(VI)/carbonate chemical system has been obtained by coupling capillary electrophoresis and ICP-MS at the ionic strength of 0.202 m in NaClO4 and for a temperature of 25°C. The following values have been obtained:
log
10
β
PuO
2
CO
3
=
8.12
±
0.02
,
${\log _{10}}{\beta _{{\rm{Pu}}{{\rm{O}}_2}{\rm{C}}{{\rm{O}}_3}}} = 8.12 \pm 0.02,$
log
10
β
PuO
2
(
CO
3
)
2
2
−
=
13.96
±
0.04
,
${\log _{10}}{\beta _{{\rm{Pu}}{{\rm{O}}_2}({\rm{C}}{{\rm{O}}_3})_2^{2 - }}} = 13.96 \pm 0.04,$
and
log
10
β
PuO
2
(
CO
3
)
3
4
−
=
18.10
±
0.03.
${\log _{10}}{\beta _{{\rm{Pu}}{{\rm{O}}_2}({\rm{C}}{{\rm{O}}_3})_3^{4 - }}} = 18.10 \pm 0.03.$
Based on the values selected by AEN/OECD, the interaction coefficients have been re-evaluated as follows:
ε
PuO
2
CO
3
=
0.02
±
0.21
,
${\varepsilon _{{\rm{Pu}}{{\rm{O}}_2}{\rm{C}}{{\rm{O}}_3}}} = 0.02 \pm 0.21,$
ε
PuO
2
(
CO
3
)
2
2
−
,
Na
+
=
0.12
±
0.08
,
${\varepsilon _{{\rm{Pu}}{{\rm{O}}_2}({\rm{C}}{{\rm{O}}_3})_2^{2 - },{\rm{N}}{{\rm{a}}^ + }}} = 0.12 \pm 0.08,$
ε
PuO
2
(
CO
3
)
3
4
−
,
Na
+
=
0.14
±
0.18
kg
⋅
mol
−
1
.
${\varepsilon _{{\rm{Pu}}{{\rm{O}}_2}({\rm{C}}{{\rm{O}}_3})_3^{4 - },{\rm{N}}{{\rm{a}}^ + }}} = 0.14 \pm 0.18{\rm{ kg}} \cdot {\rm{mo}}{{\rm{l}}^{ - 1}}.$
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Affiliation(s)
- Jean-Charles Alexandre
- CEA, DAM, DIF , F-91297 Arpajon , France
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule , 30207 Bagnols sur Cèze , France
| | - Nicolas Dacheux
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule , 30207 Bagnols sur Cèze , France
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33
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Trillaud V, Maynadié J, Manaud J, Hidalgo J, Meyer D, Podor R, Dacheux N, Clavier N. Synthesis of size-controlled UO2 microspheres from the hydrothermal conversion of U(iv) aspartate. CrystEngComm 2018. [DOI: 10.1039/c8ce01352g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A wet chemistry route towards UO2 spherical particles was designed through the hydrothermal conversion of uranium(iv) aspartate. A multi-parametric study led us to point out the conditions leading to monodisperse and size-controlled particles in the 400–2500 nm range. This simple protocol paves the way to applications in various scientific areas.
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Affiliation(s)
| | | | | | | | - D. Meyer
- ICSM
- CEA
- CNRS
- ENSCM
- Univ Montpellier
| | - R. Podor
- ICSM
- CEA
- CNRS
- ENSCM
- Univ Montpellier
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34
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Dacheux N, Simoni E. Preface. RADIOCHIM ACTA 2017. [DOI: 10.1515/ract-2017-5001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Clavier N, Cherkaski Y, Martinez J, Costis S, Cordara T, Audubert F, Brissonneau L, Dacheux N. Synthesis and Direct Sintering of Nanosized (M
IV
,M
III
)O
2‐
x
Hydrated Oxides as Electrolyte Ceramics. Chemphyschem 2017; 18:2666-2674. [DOI: 10.1002/cphc.201700647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 07/18/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Nicolas Clavier
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Yanis Cherkaski
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
- CEA/DEN/DTN/SMTA/LIPC Site de Cadarache 13108 St-Paul lez Durance France
| | - Julien Martinez
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
- CEA/DEN/DMRC/SECA/LFC Site de Marcoule-Bât. 399, BP 17171 30207 Bagnols/Cèze France
| | - Sophie Costis
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Théo Cordara
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
| | - Fabienne Audubert
- CEA/DEN/DEC/SA3C/LAMIR Site de Cadarache 13108 St-Paul lez Durance France
| | | | - Nicolas Dacheux
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257, CEA, CNRS, ENSCMUniv. Montpellier Site de Marcoule—Bât. 426, BP 17171 30207 Bagnols/Cèze France
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Cherkaski Y, Clavier N, Brissonneau L, Podor R, Dacheux N. Densification behavior and microstructure evolution of yttrium-doped ThO 2 ceramics. Ann Ital Chir 2017. [DOI: 10.1016/j.jeurceramsoc.2017.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Mesbah A, Clavier N, Elkaim E, Szenknect S, Dacheux N. In pursuit of the rhabdophane crystal structure: from the hydrated monoclinic LnPO 4 .0.667H 2 O to the hexagonal LnPO 4 (Ln = Nd, Sm, Gd, Eu and Dy). J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2017.03.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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38
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Mesbah A, Clavier N, Lozano-Rodriguez MJ, Szenknect S, Dacheux N. Incorporation of Thorium in the Zircon Structure Type through the Th 1-xEr x(SiO 4) 1-x(PO 4) x Thorite-Xenotime Solid Solution. Inorg Chem 2016; 55:11273-11282. [PMID: 27749037 DOI: 10.1021/acs.inorgchem.6b01862] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pure powdered compounds with a general formula Th1-xErx(SiO4)1-x(PO4)x belonging to the zircon-xenotime family were successfully synthesized under hydrothermal conditions (250 °C, 7 days) as recently reported for the preparation of coffinite. Therefore, a thorough, combined PXRD, EDX, EXAFS, Raman, and FTIR analysis showed the formation of a solid solution in agreement with Vegard's law. Moreover, the examination of the local structure shows that the Th-O distances remain close to those found in ThSiO4, whereas the Er-O distances show a significant decrease from 2.38(14) to 2.34(7) Å when increasing the erbium content from x = 0.2 to x = 1. The variation of the local structure also affects the PO43- groups that are surely distorted in the structure.
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Affiliation(s)
- Adel Mesbah
- ICSM, UMR 5257 CEA/CNRS/ENSCM/University of Montpellier , Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Nicolas Clavier
- ICSM, UMR 5257 CEA/CNRS/ENSCM/University of Montpellier , Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - M Janeth Lozano-Rodriguez
- HZDR, Institute of Resource Ecology, The Rossendorf Beamline at ESRF , P.O. Box 220, 38043 Grenoble, France
| | - Stephanie Szenknect
- ICSM, UMR 5257 CEA/CNRS/ENSCM/University of Montpellier , Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Nicolas Dacheux
- ICSM, UMR 5257 CEA/CNRS/ENSCM/University of Montpellier , Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
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39
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Clavier N, Bouala GIN, Léchelle J, Martinez J, Dacheux N, Podor R. Novel approaches for the in situ study of the sintering of nuclear oxide fuel materials and their surrogates. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2659] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Sintering is one of the key-points of the processing of ceramic materials. It is then of primary interest for the nuclear fuel cycle, in which it constitutes an important step in the fabrication of either UO2 or (U,Pu)O2 pellets used in current PWR reactors. The sintering of actinides oxides not only drives the final density and microstructure of the fuels, but also several characteristics that can impact significantly their behavior in the reactor. Dedicated tools are then needed to monitor the microstructure of such materials and forecast their evolution. In this frame, this paper presents the new potentialities offered by the use of environmental scanning electron microscope at high temperature (HT-ESEM) for the study of nuclear ceramics sintering. First, the results obtained from bulk pellets are detailed, either regarding original fundamental data at the grain level (such as grain boundaries and pores motion), or design of dedicated microstructures through the assessment of grain growth kinetics. Acquisition of sintering maps thanks to the combination of HT-ESEM observations and classical dilatometric measurements are also addressed. In a second part, observations undertaken at the 2-grain scale to monitor the first stage of sintering, dedicated to neck elaboration, are presented, and compared to the results currently provided by numerical models.
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Affiliation(s)
- Nicolas Clavier
- ICSM, UMR 5257 CEA/CNRS/ENSCM/Univ. Montpellier , Site de Marcoule – Bât. 426, BP 17171 , 30207 Bagnols/Cèze cedex , France
| | - Galy Ingrid Nkou Bouala
- ICSM, UMR 5257 CEA/CNRS/ENSCM/Univ. Montpellier , Site de Marcoule – Bât. 426, BP 17171 , 30207 Bagnols/Cèze cedex , France
| | - Jacques Léchelle
- CEA, DEN, DEC, SESC, LLCC, Site de Cadarache , 13108 St-Paul lez Durance , France
| | - Julien Martinez
- CEA, DEN, DTEC, SECA, LFC, Site de Marcoule , BP 17171 , 30207 Bagnols/Cèze cedex , France
| | - Nicolas Dacheux
- ICSM, UMR 5257 CEA/CNRS/ENSCM/Univ. Montpellier , Site de Marcoule – Bât. 426, BP 17171 , 30207 Bagnols/Cèze cedex , France
| | - Renaud Podor
- ICSM, UMR 5257 CEA/CNRS/ENSCM/Univ. Montpellier , Site de Marcoule – Bât. 426, BP 17171 , 30207 Bagnols/Cèze cedex , France
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40
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Neumeier S, Arinicheva Y, Clavier N, Podor R, Bukaemskiy A, Modolo G, Dacheux N, Bosbach D. The effect of the synthesis route of monazite precursors on the microstructure of sintered pellets. Progress in Nuclear Energy 2016. [DOI: 10.1016/j.pnucene.2016.07.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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41
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Gausse C, Szenknect S, Qin DW, Mesbah A, Clavier N, Neumeier S, Bosbach D, Dacheux N. Determination of the Solubility of Rhabdophanes LnPO4·0.667H2O (Ln = La to Dy). Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600517] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Clémence Gausse
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
| | - Stéphanie Szenknect
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
| | - Dan Wen Qin
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
- Sino-French Institute of Nuclear Engineering and Technology; Sun Yat-Sen University; Tang Jia Wan 519082 Zhuhai P. R. China
| | - Adel Mesbah
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
| | - Nicolas Clavier
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
| | - Stefan Neumeier
- Forschungszentrum Jülich GmbH; Institute of Energy and Climate Research - Nuclear Waste Management and Reactor Safety (IEK-6); 52425 Jülich Germany
| | - Dirk Bosbach
- Forschungszentrum Jülich GmbH; Institute of Energy and Climate Research - Nuclear Waste Management and Reactor Safety (IEK-6); 52425 Jülich Germany
| | - Nicolas Dacheux
- Institut de Chimie Séparative de Marcoule; UMR 5257 CNRS/CEA/Université Montpellier/ENSCM, Centre de Marcoule; BP 1717 30207 Bagnols sur Ceze cedex France
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42
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Clavier N, Crétaz F, Szenknect S, Mesbah A, Poinssot C, Descostes M, Dacheux N. Vibrational spectroscopy of synthetic analogues of ankoleite, chernikovite and intermediate solid solution. Spectrochim Acta A Mol Biomol Spectrosc 2016; 156:143-150. [PMID: 26688205 DOI: 10.1016/j.saa.2015.11.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 11/26/2015] [Accepted: 11/28/2015] [Indexed: 06/05/2023]
Abstract
Ankoleite (K(UO2)PO4·nH2O), chernikovite (H3O(UO2)PO4·nH2O) and intermediate solid solutions are frequently encountered in the uranium ores that result from the alteration of uranium primary minerals. This paper reports a thorough FTIR and Raman study related to synthetic analogues for these minerals. First, the vibration bands associated to the UO2(2 +) uranyl ion were used to calculate the U = O bond length which appeared in good agreement with the data coming from PXRD. Then, the examination of the phosphate vibration modes in both sets of spectra confirmed the general formulation of the samples and ruled out the presence of hydrogenphosphate groups. Finally, the presence of H2O as well as protonated H3O(+) and/or H5O2(+) species was also pointed out, and could be used to clearly differentiate the various phases prepared. Vibrational spectroscopy then appeared as an efficient method for the investigation of such analogues of natural samples. It should be particularly relevant when identifying these phases in mineral ores or assemblies.
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Affiliation(s)
- N Clavier
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université de Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France.
| | - F Crétaz
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université de Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - S Szenknect
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université de Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - A Mesbah
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université de Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - C Poinssot
- CEA/DEN/DRCP/DIR, Site de Marcoule - Bât. 400, BP 17171, 30207 Bagnols/Cèze cedex, France
| | - M Descostes
- AREVA Mines/R&D Dpt, La Défense, 92084 Paris, France
| | - N Dacheux
- ICSM, Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université de Montpellier, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France
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Mesbah A, Szenknect S, Clavier N, Lozano-Rodriguez J, Poinssot C, Den Auwer C, Ewing RC, Dacheux N. Coffinite, USiO4, Is Abundant in Nature: So Why Is It So Difficult To Synthesize? Inorg Chem 2015; 54:6687-96. [PMID: 26145720 DOI: 10.1021/ic502808n] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Coffinite, USiO4, is the second most abundant U(4+) mineral on Earth, and its formation by the alteration of the UO2 in spent nuclear fuel in a geologic repository may control the release of radionuclides to the environment. Despite its abundance in nature, the synthesis and characterization of coffinite have eluded researchers for decades. On the basis of the recent synthesis of USiO4, we can now define the experimental conditions under which coffinite is most efficiently formed. Optimal formation conditions are defined for four parameters: pH, T, heating time, and U/Si molar ratio. The adjustment of pH between 10 and 12 leads probably to the formation of a uranium(IV) hydroxo-silicate complex that acts as a precursor of uranium(IV) silicate colloids and then of coffinite. Moreover, in this pH range, the largest yield of coffinite formation (as compared with those of the two competing byproduct phases, nanometer-scale UO2 and amorphous SiO2) is obtained for 250 °C, 7 days, and 100% excess silica.
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Affiliation(s)
- Adel Mesbah
- †ICSM, UMR 5257 CEA/CNRS/UM/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Stephanie Szenknect
- †ICSM, UMR 5257 CEA/CNRS/UM/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Nicolas Clavier
- †ICSM, UMR 5257 CEA/CNRS/UM/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Janeth Lozano-Rodriguez
- ⊥HZDR, Institute of Resource Ecology, Rossendorf Beamline at ESRF, P.O. Box 220, 38043 Grenoble, France
| | - Christophe Poinssot
- ‡CEA, Nuclear Energy Division, DRCP/DIR, CEA Marcoule, Bât. 400, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
| | - Christophe Den Auwer
- ∥ICN, UMR 7272, Nice Sophia-Antipolis University, 28 av. de Valrose, 06108 Nice cedex 2, France
| | | | - Nicolas Dacheux
- †ICSM, UMR 5257 CEA/CNRS/UM/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze cedex, France
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44
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Abstract
A series of tetravalent uranium terephthalates has been solvothermally synthesized in the solvent N,N-dimethylformamide (DMF) at temperature 100-150 °C with different water amounts. Composition diagrams have been determined for the U(4+) metallic cation in the presence of terephthalic acid, and their crystal structures revealed the occurrence of two- or three-dimensional coordination polymers. In the absence of water, a mixture of two polytypes T-U(2)Cl(2)(bdc)(3)(DMF)(4) (1) and M-U(2)Cl(2)(bdc)(3)(DMF)(4) (2) has been identified at low temperature (100-110 °C) for bdc/U = 1-4 (bdc = terephthalate linker). Their structures are built up from isolated uranium centers in nine-fold coordination, surrounded by 6 carboxyl oxygen atoms, 2 oxygen atoms coming from DMF molecules and one chlorine atom. The uranium cations are linked to each other through the bdc ligand in order to generate a 3D framework. By increasing the temperature (130-150 °C), a layered like compound has been isolated, U(2)(bdc)(4)(DMF)(4) (3). It is composed of discrete actinide centers in ten-fold coordination, with 8 carboxyl oxygen atoms and 2 oxygen atoms from DMF molecules. The connection of the UO10 units with the bdc linkers generates 2D sheets. When a controlled amount of water is added to the reaction medium, the crystallization of the UiO-66-like U(6)O(4)(OH)(4)(H(2)O)(6)(bdc)(6)·10DMF solid (containing a hexanuclear sub-unit) is observed for temperature 110-120 °C and the H(2)O/U molar ratio in the range of 2-10. At higher temperature (140-150 °C), a distinct phase appeared, U(2)O(2)(bdc)(2)(DMF) (4), which consists of infinite chains of uranium centers, linked to each other via the bdc ligands. Higher water contents led to the formation of urania UO(2).
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Affiliation(s)
- Clément Falaise
- Unité de Catalyse et Chimie du Solide (UCCS) - UMR CNRS 8181, Université de Lille Nord de France, USTL-ENSCL, Bat C7, BP 90108, 59652 Villeneuve d'Ascq, France.
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Gomes Rodrigues D, Dacheux N, Pellet-Rostaing S, Faur C, Bouyer D, Monge S. The first report on phosphonate-based homopolymers combining both chelating and thermosensitive properties of gadolinium: synthesis and evaluation. Polym Chem 2015. [DOI: 10.1039/c5py00785b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Original thermoresponsive poly(acrylamide) bearing valuable carbamoylmethylphosphonate moieties was prepared for gadolinium sorption.
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Affiliation(s)
- Donatien Gomes Rodrigues
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM-ENSCM – Equipe Ingénierie et Architectures Macromoléculaires
- Université de Montpellier
- 34095 Montpellier Cedex 5
- France
- Institut de Chimie Séparative de Marcoule UMR 5257 CEA-CNRS-UM-ENSCM – Laboratoire des Interfaces des Matériaux en Evolution
| | - Nicolas Dacheux
- Institut de Chimie Séparative de Marcoule UMR 5257 CEA-CNRS-UM-ENSCM – Laboratoire des Interfaces des Matériaux en Evolution
- 30207 Bagnols sur Cèze Cedex
- France
| | - Stéphane Pellet-Rostaing
- Institut de Chimie Séparative de Marcoule UMR 5257 CEA-CNRS-UM-ENSCM – Laboratoire du Tri-ionique par des Systèmes Moléculaires auto-assemblés
- 30207 Bagnols sur Cèze Cedex
- France
| | - Catherine Faur
- Institut Européen des Membranes UMR 5635 CNRS-ENSCM-UM – Département Génie des Procédés Membranaires
- Université de Montpellier
- 34095 Montpellier, Cedex 5
- France
| | - Denis Bouyer
- Institut Européen des Membranes UMR 5635 CNRS-ENSCM-UM – Département Génie des Procédés Membranaires
- Université de Montpellier
- 34095 Montpellier, Cedex 5
- France
| | - Sophie Monge
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM-ENSCM – Equipe Ingénierie et Architectures Macromoléculaires
- Université de Montpellier
- 34095 Montpellier Cedex 5
- France
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Aupiais J, Dacheux N, Aubert C. Comparison and improvement of the resolution of several alpha liquid scintillation spectrometers for actinide measurements. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jean Aupiais
- CEA, Centre de Bruyères-le-Châtel,DIxF/DASE/RCE, BP 12, F-91680 Bruyères-le-Châtel, France
| | - Nicolas Dacheux
- Institut de Physique Nucléaire, groupe de Radiochimie, Bât 100, Université Paris Sud, F-91406 Orsay Cedex, France
| | - Cédric Aubert
- CEA, Centre de Bruyères-le-Châtel,DIxF/DASE/RCE, BP 12, F-91680 Bruyères-le-Châtel, France
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47
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Wallez G, Raison PE, Smith AL, Clavier N, Dacheux N. High-temperature behavior of dicesium molybdate Cs2MoO4: Implications for fast neutron reactors. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.04.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Clavier N, Szenknect S, Costin DT, Mesbah A, Poinssot C, Dacheux N. From thorite to coffinite: a spectroscopic study of Th(1-x)U(x)SiO4 solid solutions. Spectrochim Acta A Mol Biomol Spectrosc 2014; 118:302-307. [PMID: 24055679 DOI: 10.1016/j.saa.2013.08.093] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 08/19/2013] [Accepted: 08/23/2013] [Indexed: 06/02/2023]
Abstract
Coffinite (USiO4), along with Th(1-x)U(x)SiO4 uranothorite solid solutions, are frequently present in reduced economically exploitable uranium ores. They could also control the concentration of uranium in the environment in the case of accidental release from underground radwaste repository. This paper reports for the first time a thorough FTIR and Raman study relative to the Th(1-x)U(x)SiO4 system, including synthetic analogues of thorite and coffinite end-members. Both sets of spectra confirmed the formulation of the samples and allowed to rule out the presence of structural water molecules and/or hydroxyl groups in the coffinite. Also, no characteristic signal of UO2(2+) uranyl ion was recorded, ensuring that uranium was fully incorporated under its tetravalent oxidation state. The variation of the positions corresponding to SiO4 internal vibration modes was then followed versus the chemical composition of the samples. If the FTIR spectra did not revealed any significant shift in the bands position, several Raman modes followed a linear trend as a function of the uranium incorporation rate. On this basis, Raman spectroscopy could be considered as a promising tool for the semi-quantitative determination of chemical composition of uranothorite samples, particularly for those coming from mineral ores. Finally, the data collected for the coffinite end-member, as the first to be obtained on pure synthetic samples, allowed a review of the results previously reported in the literature for this compound.
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Affiliation(s)
- N Clavier
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule - Bât. 426, BP 17171, 30207 Bagnols/Cèze cedex, France.
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Nkou Bouala GI, Clavier N, Podor R, Cambedouzou J, Mesbah A, Brau HP, Léchelle J, Dacheux N. Preparation and characterisation of uranium oxides with spherical shapes and hierarchical structures. CrystEngComm 2014. [DOI: 10.1039/c4ce00850b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the first reports on shape-controlled uranium oxides with hierarchical structures and their mechanism of formation.
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Affiliation(s)
| | | | - R. Podor
- ICSM
- UMR 5257 CEA/CNRS/UM2/ENSCM
- , France
| | | | - A. Mesbah
- ICSM
- UMR 5257 CEA/CNRS/UM2/ENSCM
- , France
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Szenknect S, Costin DT, Clavier N, Mesbah A, Poinssot C, Vitorge P, Dacheux N. From Uranothorites to Coffinite: A Solid Solution Route to the Thermodynamic Properties of USiO4. Inorg Chem 2013; 52:6957-68. [DOI: 10.1021/ic400272s] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stéphanie Szenknect
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM,
Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze
cedex, France
| | - Dan T. Costin
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM,
Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze
cedex, France
| | - Nicolas Clavier
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM,
Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze
cedex, France
| | - Adel Mesbah
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM,
Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze
cedex, France
| | - Christophe Poinssot
- CEA, Nuclear
Energy Division, DRCP/DIR, CEA Marcoule, Bât. 400, BP 17171,
30207 Bagnols-sur-Cèze cedex, France
| | - Pierre Vitorge
- CEA, Nuclear Energy Division, DPC/SECR, Site de Saclay,
Bât. 391, 91191 Gif-sur-Yvette, France
| | - Nicolas Dacheux
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM,
Site de Marcoule − Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze
cedex, France
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