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

Suguru Takahashi; Eiji Ohtani; Tatsuya Sakamaki; Seiji Kamada; Hiroshi Fukui; Satoshi Tsutsui; Hiroshi Uchiyama; Daisuke Ishikawa; Naohisa Hirao; Yasuo Ohishi; Alfred Q.R. Baron

doi:10.1016/j.crte.2018.09.005

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

Suguru Takahashi, Eiji Ohtani, Tatsuya Sakamaki, Seiji Kamada, Hiroshi Fukui, Satoshi Tsutsui, Hiroshi Uchiyama, Daisuke Ishikawa, Naohisa Hirao, Yasuo Ohishi, Alfred Q.R. Baron

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

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×ρ−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.

Original language	English
Pages (from-to)	190-196
Number of pages	7
Journal	Comptes Rendus - Geoscience
Volume	351
Issue number	2-3
DOIs	https://doi.org/10.1016/j.crte.2018.09.005
Publication status	Published - 2019 Feb 1

Keywords

Core
FeC
High pressure and high temperature
Inelastic X-ray scattering
Sound velocity

ASJC Scopus subject areas

Global and Planetary Change
Earth and Planetary Sciences(all)

Access to Document

10.1016/j.crte.2018.09.005

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Sound velocity of Fe₃C at high pressure and high temperature determined by inelastic X-ray scattering. / Takahashi, Suguru; Ohtani, Eiji; Sakamaki, Tatsuya; Kamada, Seiji; Fukui, Hiroshi; Tsutsui, Satoshi; Uchiyama, Hiroshi; Ishikawa, Daisuke; Hirao, Naohisa; Ohishi, Yasuo; Baron, Alfred Q.R.

In: Comptes Rendus - Geoscience, Vol. 351, No. 2-3, 01.02.2019, p. 190-196.

Research output: Contribution to journal › Article › peer-review

Takahashi, Suguru ; Ohtani, Eiji ; Sakamaki, Tatsuya ; Kamada, Seiji ; Fukui, Hiroshi ; Tsutsui, Satoshi ; Uchiyama, Hiroshi ; Ishikawa, Daisuke ; Hirao, Naohisa ; Ohishi, Yasuo ; Baron, Alfred Q.R. / Sound velocity of Fe₃C at high pressure and high temperature determined by inelastic X-ray scattering. In: Comptes Rendus - Geoscience. 2019 ; Vol. 351, No. 2-3. pp. 190-196.

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

abstract = "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 (VP)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: VP=1.09±0.14×ρ−1.79±1.26. The result indicates that VP and VS (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.",

keywords = "Core, FeC, High pressure and high temperature, Inelastic X-ray scattering, Sound velocity",

author = "Suguru Takahashi and Eiji Ohtani and Tatsuya Sakamaki and Seiji Kamada and Hiroshi Fukui and Satoshi Tsutsui and Hiroshi Uchiyama and Daisuke Ishikawa and Naohisa Hirao and Yasuo Ohishi and Baron, {Alfred Q.R.}",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant No. 22000002 and No. 15H05748 to E.O. The synchrotron radiation experiments were performed under contracts of the SPring-8 Proposal Nos. 2014B1269, 2014B1465, 2015A1539, 2015A1627, 2015B1202, 2015B1334, 2016A1171, 2016B1419, 2017B1214, 20160096, and 20170051. Publisher Copyright: {\textcopyright} 2018 Acad{\'e}mie des sciences",

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T1 - Sound velocity of Fe3C at high pressure and high temperature determined by inelastic X-ray scattering

AU - Takahashi, Suguru

AU - Ohtani, Eiji

AU - Sakamaki, Tatsuya

AU - Kamada, Seiji

AU - Fukui, Hiroshi

AU - Tsutsui, Satoshi

AU - Uchiyama, Hiroshi

AU - Ishikawa, Daisuke

AU - Hirao, Naohisa

AU - Ohishi, Yasuo

AU - Baron, Alfred Q.R.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant No. 22000002 and No. 15H05748 to E.O. The synchrotron radiation experiments were performed under contracts of the SPring-8 Proposal Nos. 2014B1269, 2014B1465, 2015A1539, 2015A1627, 2015B1202, 2015B1334, 2016A1171, 2016B1419, 2017B1214, 20160096, and 20170051. Publisher Copyright: © 2018 Académie des sciences

PY - 2019/2/1

Y1 - 2019/2/1

N2 - 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 (VP)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: VP=1.09±0.14×ρ−1.79±1.26. The result indicates that VP and VS (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.

AB - 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 (VP)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: VP=1.09±0.14×ρ−1.79±1.26. The result indicates that VP and VS (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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