Elastic constants of single-crystal Pt measured up to 20 GPa based on inelastic X-ray scattering: Implication for the establishment of an equation of state - 09/05/19

Doi : 10.1016/j.crte.2018.11.003

Seiji Kamada ^a,^b,^⁎ , Hiroshi Fukui ^c,^d, Akira Yoneda ^e, Hitoshi Gomi ^e, Fumiya Maeda ^b, Satoshi Tsutsui ^f, Hiroshi Uchiyama ^f, Naohisa Hirao ^f, Daisuke Ishikawa ^f, Alfred Q.R. Baron ^d
^a Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki, Aoba, Sendai, 980-8578 Miyagi, Japan
^b Department of Earth Science, Graduate School of Science, Tohoku University, 6-3 Aramaki, Aoba, Sendai, 980-8578 Miyagi, Japan
^c Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori, 678-1297 Hyogo, Japan
^d Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo, 679-5148 Hyogo Japan
^e Institute for Planetary Materials, Okayama University, 827 Yamada, Misasa, 682-0193 Tottori, Japan
^f Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, 679-5198 Hyogo, Japan

^⁎Corresponding author. Department of Earth Science, Graduate School of Science, Tohoku University, 6-3 Aramaki, Aoba, Sendai, 980-8578 Miyagi, Japan.Department of Earth Science, Graduate School of Science, Tohoku University6-3 Aramaki, Aoba, SendaiMiyagi980-8578Japan

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Abstract

Phonon velocities and densities for Pt were measured based on inelastic X-ray scattering from ambient pressure to 20GPa in order to independently determine its equation of state (EOS). Phonon velocities were determined with sine dispersion relations. C_ij values were obtained by fitting phonon velocities and densities to the Christoffel equation. We found that the obtained C_ijs were in good agreement with previously reported C_ijs at ambient condition. Based on the C_ij values in various conditions, experimental pressures were calculated. The EOS of Pt as a primary pressure scale was determined based on the experimental pressures. We report K’=5.17 with fixed K_T=274.1GPa and V₀=60.360 Å³ for Vinet EOS. Our scale is in good agreement with several previously published scales based on shock experiments and XRD.

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Keywords : Primary pressure scale, Platinum, Single crystal, Inelastic X-ray scattering, Diamond anvil cell

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Vol 351 - N° 2-3

P. 236-242 - février 2019 Retour au numéro

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Elastic constants of single-crystal Pt measured up to 20 GPa based on inelastic X-ray scattering: Implication for the establishment of an equation of state - 09/05/19

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