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Kennedy BJ, Ablott TA, Avdeev M, Carter ML, Losurdo L, Saura-Muzquiz M, Thorogood KJ, Ting J, Wallwork KS, Zhang Z, Zhu H, Thorogood GJ. Synthesis and Structure of Oxygen Deficient Lead-Technetium Pyrochlore, the First Example of a Valence V Technetium Oxide. Front Chem 2021; 9:706269. [PMID: 34277573 PMCID: PMC8281135 DOI: 10.3389/fchem.2021.706269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 06/08/2021] [Indexed: 11/13/2022] Open
Abstract
The structure of lead-technetium pyrochlore has been refined in space group Fd3¯m with a = 10.36584(2) Å using a combination of synchrotron X-ray and neutron powder diffraction data and confirmed via Electron Diffraction. The oxide is found to be oxygen deficient with a stoichiometry of Pb2Tc2O7-d. Displacive disorder of the Pb cations is evident from the refinements, as has been observed in Bi2Tc2O7-d. X-ray absorption spectroscopic measurements at the Tc K-edge demonstrate the valence of the Tc is greater than 4.0 as anticipated from the refined oxygen stoichiometry. Raman spectroscopy confirms the presence of disorder leading us to conclude that this pyrochlore is the first example of a valence V technetium oxide.
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Affiliation(s)
- Brendan J Kennedy
- School of Chemistry, The University of Sydney, Sydney, NSW, Australia
| | - Timothy A Ablott
- Nuclear Fuel Cycle, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Maxim Avdeev
- School of Chemistry, The University of Sydney, Sydney, NSW, Australia.,Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Melody L Carter
- Nuclear Fuel Cycle, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Linda Losurdo
- School of Chemistry, The University of Sydney, Sydney, NSW, Australia
| | | | - Kevin J Thorogood
- Nuclear Materials, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Jimmy Ting
- School of Chemistry, The University of Sydney, Sydney, NSW, Australia
| | - Kia S Wallwork
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC, Australia
| | - Zhaoming Zhang
- Nuclear Fuel Cycle, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Hanliang Zhu
- Nuclear Fuel Cycle, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
| | - Gordon J Thorogood
- Nuclear Fuel Cycle, Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia.,Department of Nuclear System Safety Engineering, Nagaoka University of Technology, Nagaoka, Japan
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2
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Sreena MTS, Rao PP, Raj MAKV, Babu MPS. Influence of Structural Disorder on the Photoluminescence Properties of Eu3+
Doped Red Phosphors: Ca2
Y3-x
Nb3
O14
: x
Eu3+. ChemistrySelect 2016. [DOI: 10.1002/slct.201600630] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ms. T. S. Sreena
- Materials Science and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (NIIST); Trivandrum- 695 019 India
| | - P. Prabhakar Rao
- Materials Science and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (NIIST); Trivandrum- 695 019 India
| | - Ms. Athira K. V. Raj
- Materials Science and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (NIIST); Trivandrum- 695 019 India
| | - Ms. Parvathi S Babu
- Materials Science and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (NIIST); Trivandrum- 695 019 India
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3
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Mouta R, Silva RX, Paschoal CWA. Tolerance factor for pyrochlores and related structures. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2013; 69:439-445. [PMID: 24056352 DOI: 10.1107/s2052519213020514] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 07/23/2013] [Indexed: 06/02/2023]
Abstract
In this work a new empirical tolerance factor for compounds with pyrochlore structure is proposed. This suggested tolerance factor is based on experimental structural data and on the tolerance factors proposed. However, since it does not depend on the structural data, this new tolerance factor permits the prediction of some properties of these compounds directly. Also, a good structure stability field for the pyrochlore formation is observed when this tolerance factor is used.
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Affiliation(s)
- R Mouta
- Departamento de Física, CCET, Universidade Federal do Maranhão, 65085-580, São Luís - MA, Brazil
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4
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Krivovichev SV, Mentré O, Siidra OI, Colmont M, Filatov SK. Anion-centered tetrahedra in inorganic compounds. Chem Rev 2013; 113:6459-535. [PMID: 23621387 DOI: 10.1021/cr3004696] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergey V Krivovichev
- St. Petersburg State University , Department of Crystallography, University Emb. 7/9, 199034 St. Petersburg, Russia
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Blanchard PE, Clements R, Kennedy BJ, Ling CD, Reynolds E, Avdeev M, Stampfl AP, Zhang Z, Jang LY. Does Local Disorder Occur in the Pyrochlore Zirconates? Inorg Chem 2012; 51:13237-44. [PMID: 23057771 DOI: 10.1021/ic301677b] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Richard Clements
- School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia
| | - Brendan J. Kennedy
- School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia
| | - Chris D. Ling
- School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia
| | - Emily Reynolds
- School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia
| | - Max Avdeev
- Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
| | - Anton P.J. Stampfl
- Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
| | - Zhaoming Zhang
- Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
| | - Ling-Yun Jang
- Facility Utilization
Group, Experiment Facility Division, National Synchrotron Radiation Research Center, Hsinchu
30076, Taiwan
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Clements R, Hester JR, Kennedy BJ, Ling CD, Stampfl AP. The fluorite–pyrochlore transformation of Ho2−yNdyZr2O7. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.05.054] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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8
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Pasciak M, Welberry TR. Diffuse scattering and local structure modeling in ferroelectrics. ACTA ACUST UNITED AC 2011. [DOI: 10.1524/zkri.2011.1300] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Müller-Buschbaum H. Zur Kristallchemie der Alkali-, Erdalkali-, Selten Erdmetall-Oxozirconate und Zirconiumoxide. On the Crystal Chemistry of Alkali-, Alkaline-Earth-, Rare Earth-Oxozirconates and Zirconium Oxides. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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Synthesis and structural studies of lanthanide substituted bismuth–titanium pyrochlores. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2008.12.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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McQueen TM, West DV, Muegge B, Huang Q, Noble K, Zandbergen HW, Cava RJ. Frustrated ferroelectricity in niobate pyrochlores. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:235210. [PMID: 21694301 DOI: 10.1088/0953-8984/20/23/235210] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The crystal structures of the A(2)B(2)O(7-x) niobium based pyrochlores Y(2)(Nb(0.86)Y(0.14))(2)O(6.91), CaYNb(2)O(7), and Y(2)NbTiO(7) are reported, determined by means of powder neutron diffraction. These compounds represent the first observation of B-site displacements in the pyrochlore structure: the B-site ions are found to be displaced from the ideal pyrochlore positions, creating electric dipoles. The orientations of these dipoles are fully analogous to orientations of the magnetic moments in Ising spin based magnetically frustrated pyrochlores. Diffuse scattering in electron diffraction patterns shows that the displacements are only short range ordered, indicative of geometric frustration of the collective dielectric state of the materials. Comparison to the crystal structure of the Nb(5+) (d(0)) pyrochlore La(2)ScNbO(7) supports the prediction that charge singlets, driven by the tendency of Nb to form metal-metal bonds, are present in these pyrochlores. The observed lack of long range order to these singlets suggests that Nb(4+) based pyrochlores represent the dielectric analogy to the geometric frustration of magnetic moments observed in rare earth pyrochlores.
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Affiliation(s)
- T M McQueen
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
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Somphon W, Ting V, Liu Y, Withers R, Zhou Q, Kennedy B. Local crystal chemistry, structured diffuse scattering and the dielectric properties of (Bi1−xYx)2(MIIINbV)O7 (M=Fe3+, In3+) Bi-pyrochlores. J SOLID STATE CHEM 2006. [DOI: 10.1016/j.jssc.2006.04.046] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Vanderah TA, Levin I, Lufaso MW. An Unexpected Crystal-Chemical Principle for the Pyrochlore Structure. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500234] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Zhou Q, Kennedy BJ, Ting V, Withers RL. Thermal expansion and cation disorder in Bi2InNbO7. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2004.12.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Harvey EJ, Whittle KR, Lumpkin GR, Smith RI, Redfern SA. Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2004.12.030] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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