The structure and elasticity of cubic Fe-Si alloys at high pressures
| Autor: | Simon Ayrinhac, E. Boulard, Daniele Antonangeli, Frédéric Decremps, Michael Hanfland, E. Edmund, M. Gauthier, Nicolas Guignot, Guillaume Morard, Mohamed Mezouar |
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| Přispěvatelé: | Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Lawrence Livermore National Laboratory (LLNL), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), IMPMC, Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Diffraction
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] Materials science Condensed matter physics [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Synchrotron law.invention Condensed Matter::Materials Science law Picosecond 0103 physical sciences engineering [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Elasticity (economics) [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2019, 100 (13), pp.2295-2309. ⟨10.1103/PhysRevB.100.134105⟩ Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2019, 100 (13), pp.2295-2309. ⟨10.1103/PhysRevB.100.134105⟩ Physical Review B: Condensed Matter and Materials Physics Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2019, 100 (13), ⟨10.1103/PhysRevB.100.134105⟩ |
| ISSN: | 1098-0121 1550-235X |
| Popis: | Using a combination of picosecond acoustics and synchrotron x-ray diffraction, the sound velocities and equations of state of Fe-Si alloys have been determined over a wide range of compositions (10--29 at. % Si) and pressures (up to 65 GPa) under quasihydrostatic conditions. We observe marked variation in the elastic properties of the alloys depending on synthesis method and degree of Si ordering. In particular, it is observed that there is a sharp change in the density dependence of the sound velocities which coincides with the observation of long-range ordering by diffraction methods. This change in elasticity is probably due to a change in bond character of the Fe-Si alloy. Furthermore, the bcc-hcp transition in these alloys has been mapped to high pressures and Si contents. We observed that the onset of the transition changes by more than 6 GPa per at. % for alloys containing more than $\ensuremath{\sim}15$ at. % Si. |
| Databáze: | OpenAIRE |
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