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

被引：7

作者：

Takahashi, Suguru ^{[1
]}

Ohtani, Eiji ^{[1
]}

Sakamaki, Tatsuya ^{[1
]}

Kamada, Seiji ^{[2
]}

Fukui, Hiroshi ^{[3
,4
]}

Tsutsui, Satoshi ^{[5
]}

Uchiyama, Hiroshi ^{[5
]}

Ishikawa, Daisuke ^{[4
,5
]}

Hirao, Naohisa ^{[5
]}

Ohishi, Yasuo ^{[5
]}

Baron, Alfred Q. R. ^{[4
]}

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Earth & Planetary Mat Sci, Sendai, Miyagi 9808578, Japan

[2] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan

[3] Univ Hyogo, Grad Sch Mat Sci, Ctr Novel Mat Sci Multiextreme Condit, Kamigori, Hyogo 6500044, Japan

[4] RIKEN SPring 8 Ctr, Mat Dynam Lab, Sayo, Hyogo 6795148, Japan

[5] Japan Synchrotron Radiat Res Inst JASRI, Sayo, Hyogo 6795198, Japan

来源：

COMPTES RENDUS GEOSCIENCE | 2019年 / 351卷 / 2-3期

关键词：

Sound velocity; Fe3C; High pressure and high temperature; Inelastic X-ray scattering; Core; IRON; CORE; CARBON; GPA;

D O I：

10.1016/j.crte.2018.09.005

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The sound velocity of Fe3C was measured at pressures from 33 to 86 GPa and at ambient and high temperatures up to 2300 K 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: V-P = 1.09(+/- 0.14) x rho-1.79(+/- 1.26). 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. (C) 2018 Academie des sciences. Published by Elsevier Masson SAS.

引用

页码：190 / 196

页数：7

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