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Zanatta M, Cormier L, Hennet L, Petrillo C, Sacchetti F. Real-time observation of the isothermal crystallization kinetics in a deeply supercooled liquid. Sci Rep 2017; 7:43671. [PMID: 28255173 PMCID: PMC5334641 DOI: 10.1038/srep43671] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 01/26/2017] [Indexed: 11/16/2022] Open
Abstract
Below the melting temperature Tm, crystals are the stable phase of typical elemental or molecular systems. However, cooling down a liquid below Tm, crystallization is anything but inevitable. The liquid can be supercooled, eventually forming a glass below the glass transition temperature Tg. Despite their long lifetimes and the presence of strong barriers that produces an apparent stability, supercooled liquids and glasses remain intrinsically a metastable state and thermodynamically unstable towards the crystal. Here we investigated the isothermal crystallization kinetics of the prototypical strong glassformer GeO2 in the deep supercooled liquid at 1100 K, about half-way between Tm and Tg. The crystallization process has been observed through time-resolved neutron diffraction for about three days. Data show a continuous reorganization of the amorphous structure towards the alpha-quartz phase with the final material composed by crystalline domains plunged into a low-density, residual amorphous matrix. A quantitative analysis of the diffraction patterns allows determining the time evolution of the relative fractions of crystal and amorphous, that was interpreted through an empirical model for the crystallization kinetics. This approach provides a very good description of the experimental data and identifies a predator-prey-like mechanism between crystal and amorphous, where the density variation acts as a blocking barrier.
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Affiliation(s)
- M Zanatta
- Dipartimento di Informatica, Università di Verona, I-37134 Verona, Italy.,ISC-CNR c/o Dipartimento di Fisica, Sapienza Università di Roma, I-00185 Roma, Italy
| | - L Cormier
- Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Sorbonne Universités, UPMC Université Paris 06, CNRS UMR 7590, Muséum National d'Histoire Naturelle, IRD UMR 206, F-75005 Paris, France
| | - L Hennet
- Conditions Extrêmes et Matériaux: Haute Température et Irradiation, CEMHTI-CNRS, Université d'Orléans, F-45071 Orléans, France.,Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, F-91191 Gif sur Yvette, France
| | - C Petrillo
- Dipartimento di Fisica e Geologia, Università di Perugia, I-06123 Perugia, Italy.,IOM-CNR c/o Dipartimento di Fisica e Geologia, Università di Perugia, I-06123 Perugia, Italy
| | - F Sacchetti
- Dipartimento di Fisica e Geologia, Università di Perugia, I-06123 Perugia, Italy.,IOM-CNR c/o Dipartimento di Fisica e Geologia, Università di Perugia, I-06123 Perugia, Italy
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Magazù S, Migliardo F, Benedetto A, La Torre R, Hennet L. Comments on: Bio-protective effects of homologous disaccharides on biological macromolecules. Eur Biophys J 2016; 45:379. [PMID: 27015818 DOI: 10.1007/s00249-016-1124-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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3
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Leontyev IN, Kuriganova AB, Leontyev NG, Hennet L, Rakhmatullin A, Smirnova NV, Dmitriev V. Size dependence of the lattice parameters of carbon supported platinum nanoparticles: X-ray diffraction analysis and theoretical considerations. RSC Adv 2014. [DOI: 10.1039/c4ra04809a] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [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] Open
Abstract
The size effect of Pt/C nanoparticles with diameters ranging from 2 to 28 nm have been studied using X-ray diffraction.
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Affiliation(s)
- I. N. Leontyev
- CNRS
- CEMHTI UPR 3079
- Univ. Orleans
- F-45071 Orleans, France
- LE STUDIUM
| | | | - N. G. Leontyev
- Azov-Black Sea Agricultural State Academy
- Zernograd, Russia
| | - L. Hennet
- CNRS
- CEMHTI UPR 3079
- Univ. Orleans
- F-45071 Orleans, France
| | | | - N. V. Smirnova
- South-Russian State Technical University
- Novochercassk, Russia
| | - V. Dmitriev
- Swiss-Norwegian Beam Lines at ESRF
- F-38043 Grenoble, France
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Greaves GN, Wilding MC, Hennet L, Langstaff D, Kargl F, Benmore CJ, Weber JKR. Comment on "liquid-liquid phase transition in supercooled yttria-alumina". Phys Rev Lett 2011; 106:119601-119602. [PMID: 21469907 DOI: 10.1103/physrevlett.106.119601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Revised: 06/01/2010] [Indexed: 05/30/2023]
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Gruner S, Marczinke J, Hennet L, Hoyer W, Cuello GJ. On the atomic structure of liquid Ni-Si alloys: a neutron diffraction study. J Phys Condens Matter 2009; 21:385403. [PMID: 21832368 DOI: 10.1088/0953-8984/21/38/385403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The atomic structure of the liquid NiSi and NiSi(2) alloys is investigated by means of neutron diffraction experiments with isotopic substitution. From experimental data-sets obtained using four Ni isotopes, partial structure factors and pair correlation functions are obtained by applying a reverse Monte Carlo modelling approach. Both alloys were found to exhibit a strong tendency to hetero-coordination within the first coordination shell. In particular, covalent Si-Si bonds with somewhat greater distances seem to influence the structure of the liquid NiSi alloy.
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Affiliation(s)
- S Gruner
- Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
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Greaves GN, Wilding MC, Fearn S, Langstaff D, Kargl F, Cox S, Van QV, Majerus O, Benmore CJ, Weber R, Martin CM, Hennet L. Detection of First-Order Liquid/Liquid Phase Transitions in Yttrium Oxide-Aluminum Oxide Melts. Science 2008; 322:566-70. [DOI: 10.1126/science.1160766] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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7
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Fischer HE, Hennet L, Cristiglio V, Zanghi D, Pozdnyakova I, May RP, Price DL, Wood S. Magnetic critical scattering in solid Co 80Pd 20. J Phys Condens Matter 2007; 19:415106. [PMID: 28192318 DOI: 10.1088/0953-8984/19/41/415106] [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: 06/06/2023]
Abstract
Using small-angle neutron scattering combined with a containerless aerodynamic levitation technique for high temperatures, we have measured the temperature dependence of the correlation length ξ of near-critical magnetic fluctuations in the solid phase of the completely miscible fcc alloy Co80Pd20. A fit to our data yields a critical exponent ν = 0.76 ± 0.05 for the divergence of ξ(T) above the ferromagnetic transition temperature Tc. This value of ν is consistent with the prediction of the three-dimensional Heisenberg model for magnetic critical scattering.
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Affiliation(s)
- H E Fischer
- Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble cedex 9, France
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Cristiglio V, Hennet L, Cuello GJ, Pozdnyakova I, Johnson MR, Fischer HE, Zanghi D, Van QV, Wilding MC, Greaves GN, Price DL. Structure of molten yttrium aluminates: a neutron diffraction study. J Phys Condens Matter 2007; 19:415105. [PMID: 28192317 DOI: 10.1088/0953-8984/19/41/415105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We used the aerodynamic levitation technique combined with CO2 laser heating to study the structure of liquid yttrium aluminates above their melting point with neutron diffraction. For various yttria contents, we determined the structure factors and corresponding pair correlation functions describing the short-range order in the liquids. In particular, we derived Al-O and Y-O bond distances and coordination numbers. Experimental data are compared with ab initio molecular dynamics, carried out using the VASP code where the interatomic forces are obtained from density functional theory. In particular, partial pair correlation functions have been calculated and are in relatively good agreement with the experimental observations.
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Affiliation(s)
- V Cristiglio
- Centre de Recherche sur les Matériaux à Haute Température, CNRS-CRMHT, 1d avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France. Institut Laue-Langevin, 6 rue Jules Horowitz, BP48 Grenoble cedex 9, France
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Pozdnyakova I, Hennet L, Brun JF, Zanghi D, Brassamin S, Cristiglio V, Price DL, Albergamo F, Bytchkov A, Jahn S, Saboungi ML. Longitudinal excitations in Mg–Al–O refractory oxide melts studied by inelastic x-ray scattering. J Chem Phys 2007; 126:114505. [PMID: 17381218 DOI: 10.1063/1.2647068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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] Open
Abstract
The dynamic structure factor S(Q,omega) of the refractory oxide melts MgAl2O4 and MgAl4O7 is studied by inelastic x-ray scattering with aerodynamic levitation and laser heating. This technique allows the authors to measure simultaneously the elastic response and transport properties of melts under extreme temperatures. Over the wave vector Q range of 1-8 nm-1 the data can be fitted with a generalized hydrodynamic model that incorporates a slow component described by a single relaxation time and an effectively instantaneous fast component. Their study provides estimates of high-frequency sound velocities and viscosities of the Mg-Al-O melts. In contrast to liquid metals, the dispersion of the high-frequency sound mode is found to be linear, and the generalized viscosity to be Q independent. Both experiment and simulation show a weak viscosity maximum around the MgAl4O7 composition.
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Affiliation(s)
- I Pozdnyakova
- CRMHT, 1d Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France.
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Hennet L, Pozdnyakova I, Bytchkov A, Price DL, Greaves GN, Wilding M, Fearn S, Martin CM, Thiaudière D, Bérar JF, Boudet N, Saboungi ML. Development of structural order during supercooling of a fragile oxide melt. J Chem Phys 2007; 126:074906. [PMID: 17328633 DOI: 10.1063/1.2646812] [Citation(s) in RCA: 31] [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: 11/14/2022] Open
Abstract
The authors have studied the structural evolution of the fragile glass-forming liquid CaAl2O4 during supercooling from the stable liquid phase to the cold glass below Tg. The evolution is characterized by a sharpening of the first diffraction peak and a shortening of the average nearest-neighbor bond length around 1.25Tg, indicating an increase in the degree of both intermediate-range and short-range orders occurring close to the dynamical crossover temperature. The cooling curve developed a kink at this temperature, indicating a simultaneous change in thermodynamic properties.
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Affiliation(s)
- L Hennet
- Centre de Recherche sur les Matériaux à Haute Température, 45071 Orléans Cedex 2, France.
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Pozdnyakova I, Hennet L, Mathiak G, Brillo J, Zanghi D, Brun JF, Brassamin S, Bytchkov A, Cristiglio V, Véron E, Matzen G, Geandier G, Thiaudière D, Moss SC, Spaepen F, Egry I, Price DL. Structural properties of molten dilute aluminium-transition metal alloys. J Phys Condens Matter 2006; 18:6469-6480. [PMID: 21690847 DOI: 10.1088/0953-8984/18/28/003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The short-range order in liquid binary Al-rich alloys (Al-Fe, Al-Ti) was studied by x-ray diffraction. The measurements were performed using a novel containerless technique which combines aerodynamic levitation with inductive heating. The average structure factors, S(Q), have been determined for various temperatures and compositions in the stable liquid state. From S(Q), the pair correlation functions, g(r), have been calculated. The first interatomic distance is nearly temperature-independent, whereas the first-shell coordination number decreases with increasing temperature for all the alloys investigated. For the Al-Fe alloys, room-temperature scanning electron microscropy (SEM) studies show the formation of a microstructure, namely the existence of Al(13)Fe(4) inclusions in the Al matrix.
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Affiliation(s)
- I Pozdnyakova
- Centre de Recherche sur les Matériaux à Haute Température, CNRS-CRMHT, 1d avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France
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Abstract
Collective excitations have been observed in liquid aluminum oxide at high temperatures by combining a containerless sample environment with inelastic x-ray scattering. The excitation spectra show a well-defined triplet peak structure at lower wave vectors Q (1 to 6 nanometers-1) and a single quasi-elastic peak at higher Q. The high-Q spectra are well described by kinetic theory. The low-Q spectra require a frequency-dependent viscosity and provide previously unknown experimental constraints on the behavior of liquids at the interface between atomistic and continuum theory.
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Affiliation(s)
- H Sinn
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
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13
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Landron C, Hennet L, Jenkins TE, Greaves GN, Coutures JP, Soper AK. Liquid alumina: detailed atomic coordination determined from neutron diffraction data using empirical potential structure refinement. Phys Rev Lett 2001; 86:4839-4842. [PMID: 11384361 DOI: 10.1103/physrevlett.86.4839] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2000] [Indexed: 05/23/2023]
Abstract
The neutron scattering structure factor S(N)(Q) for a 40 mg drop of molten alumina (Al2O3) held at 2500 K, using a laser-heated aerodynamic levitation furnace, is measured for the first time. A 1700 atom model of liquid alumina is generated from these data using the technique of empirical potential structural refinement. About 62% of the aluminum sites are 4-fold coordinated, matching the mostly triply coordinated oxygen sites, but some 24% of the aluminum sites are 5-fold coordinated. The octahedral aluminum sites found in crystalline alpha-Al2O3 occur only at the 2% level in liquid alumina.
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Affiliation(s)
- C Landron
- Centre de Recherches sur les Matériaux à Haute Température, 45071, Orléans Cedex 2, France
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