Sound velocity of Fe₃C at high pressure and high temperature determined by inelastic X-ray scattering - 09/05/19

Doi : 10.1016/j.crte.2018.09.005

Suguru Takahashi ^a, Eiji Ohtani ^a,^⁎ , Tatsuya Sakamaki ^a, Seiji Kamada ^b, Hiroshi Fukui ^c,^d, Satoshi Tsutsui ^e, Hiroshi Uchiyama ^e, Daisuke Ishikawa ^d,^e, Naohisa Hirao ^e, Yasuo Ohishi ^e, Alfred Q.R. Baron ^d
^a Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
^b Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
^c Center for Novel Material Science under Multi-Extreme Conditions, Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
^d Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
^e Japan Synchrotron Radiation Research Institute (JASRI), Hyogo 679-5198, Japan

^⁎Corresponding author.

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Abstract

The sound velocity of Fe₃C was measured at pressures from 33 to 86GPa and at ambient and high temperatures up to 2300K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond anvil cells (DACs). The compressional velocity (V_P) and density of Fe₃C at room temperature were observed to follow a linear relationship (Birch's law). The temperature dependency of Birch's law was not clearly observed and can be ignored. Birch's law for Fe₃C is expressed by: . The result indicates that V_P and V_S (shear velocity) of the preliminary reference Earth model (PREM) inner core at the Inner Core Boundary (ICB) were by 12% and 48% smaller than those of Fe₃C, which could be accounted for by the premelting effect by analogy from pure Fe or by partial melting of the Fe–Fe₃C mixture in the inner core.

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Keywords : Sound velocity, Fe₃C, High pressure and high temperature, Inelastic X-ray scattering, Core

Plan

Introduction

Experimental procedure

Sample preparation

IXS at SPring-8

Results

Measurements of IXS of Fe₃C

Birch's law of Fe₃C

Discussion

The stability of Fe₃C in the inner core

Birch's law of Fe₃C and the sound velocity of Fe₃C under the inner core conditions

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Vol 351 - N° 2-3

P. 190-196 - février 2019 Retour au numéro

Article précédent

Development of density measurement for metals at high pressures and high temperatures using X-ray absorption imaging combined with externally heated diamond anvil cell
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Sound velocity of Fe₃C at high pressure and high temperature determined by inelastic X-ray scattering - 09/05/19

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