Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering

Takanori Sakairi; Tatsuya Sakamaki; Eiji Ohtani; Hiroshi Fukui; Seiji Kamada; Satoshi Tsutsui; Hiroshi Uchiyama; Alfred Q.R. Baron

doi:10.2138/am-2018-6072

Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering

Takanori Sakairi, Tatsuya Sakamaki, Eiji Ohtani, Hiroshi Fukui, Seiji Kamada, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

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

14 Citations (Scopus)

Abstract

The sound velocity of hcp Fe_0.89Si_0.11 (Fe-6wt% Si) alloy was measured at pressures from 45 to 84 GPa and temperatures of 300 and 1800 K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond-anvil cells (DACs). The compressional velocity (ν_P) and density (ρ) of the Fe-Si alloy are observed to follow a linear relationship at a given temperature. For hcp Fe_0.89Si_0.11 alloy we found ν_P = 1.030 (±0.008) × ρ - 1.45 (±0.08) + [3.8 × 10^-5(T - 300)×(ρ - 15.37)], including non-negligible temperature dependence. The present results of sound velocity and density of hcp Fe_0.89Si_0.11 alloy indicates that 3~6 wt% of silicon in the inner core with additional amount of Ni can explain the compressional velocity (ν_P) and density (ρ) of the "preliminary Earth reference model" (PREM), assuming a temperature of 5500 K and that silicon is the only light element in the inner core.

Original language	English
Pages (from-to)	85-90
Number of pages	6
Journal	American Mineralogist
Volume	103
Issue number	1
DOIs	https://doi.org/10.2138/am-2018-6072
Publication status	Published - 2018 Jan 26

Keywords

Birch's law
Fe-Si alloy
High pressure
High temperature
Inelastic X-ray scattering
Inner core
Silicon
Sound velocity

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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10.2138/am-2018-6072

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@article{de847e73aafd4fc6a1d98bc3d19ee341,

title = "Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering",

abstract = "The sound velocity of hcp Fe0.89Si0.11 (Fe-6wt% Si) alloy was measured at pressures from 45 to 84 GPa and temperatures of 300 and 1800 K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond-anvil cells (DACs). The compressional velocity (νP) and density (ρ) of the Fe-Si alloy are observed to follow a linear relationship at a given temperature. For hcp Fe0.89Si0.11 alloy we found νP = 1.030 (±0.008) × ρ - 1.45 (±0.08) + [3.8 × 10-5(T - 300)×(ρ - 15.37)], including non-negligible temperature dependence. The present results of sound velocity and density of hcp Fe0.89Si0.11 alloy indicates that 3~6 wt% of silicon in the inner core with additional amount of Ni can explain the compressional velocity (νP) and density (ρ) of the {"}preliminary Earth reference model{"} (PREM), assuming a temperature of 5500 K and that silicon is the only light element in the inner core.",

keywords = "Birch's law, Fe-Si alloy, High pressure, High temperature, Inelastic X-ray scattering, Inner core, Silicon, Sound velocity",

author = "Takanori Sakairi and Tatsuya Sakamaki and Eiji Ohtani and Hiroshi Fukui and Seiji Kamada and Satoshi Tsutsui and Hiroshi Uchiyama and Baron, {Alfred Q.R.}",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant Nos. 15H05748 to E.O. and 26247089 and 16H01112 to T. Sakamaki. This work was also supported partly by the Ministry of Education and Science of the Russian Federation (project 14.B25.31.0032) to E.O. T. Sakairi gratefully acknowledges JSPS for providing a research fellowship. The synchrotron radiation experiments were performed under contracts of the SPring-8 (Proposal Nos. 2012A1255, 2012B1439, 2013A1377, 2013A1492, 2013B1078, 2013B1094, 2014A1100, 2014B1269, 2014B1465, 2015A1539, 2015A1627, 2015B1202, and 2015B1334). Publisher Copyright: {\textcopyright} 2018 Walter de Gruyter GmbH, Berlin/Boston.",

year = "2018",

month = jan,

day = "26",

doi = "10.2138/am-2018-6072",

language = "English",

volume = "103",

pages = "85--90",

journal = "American Mineralogist",

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TY - JOUR

T1 - Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering

AU - Sakairi, Takanori

AU - Sakamaki, Tatsuya

AU - Ohtani, Eiji

AU - Fukui, Hiroshi

AU - Kamada, Seiji

AU - Tsutsui, Satoshi

AU - Uchiyama, Hiroshi

AU - Baron, Alfred Q.R.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant Nos. 15H05748 to E.O. and 26247089 and 16H01112 to T. Sakamaki. This work was also supported partly by the Ministry of Education and Science of the Russian Federation (project 14.B25.31.0032) to E.O. T. Sakairi gratefully acknowledges JSPS for providing a research fellowship. The synchrotron radiation experiments were performed under contracts of the SPring-8 (Proposal Nos. 2012A1255, 2012B1439, 2013A1377, 2013A1492, 2013B1078, 2013B1094, 2014A1100, 2014B1269, 2014B1465, 2015A1539, 2015A1627, 2015B1202, and 2015B1334). Publisher Copyright: © 2018 Walter de Gruyter GmbH, Berlin/Boston.

PY - 2018/1/26

Y1 - 2018/1/26

N2 - The sound velocity of hcp Fe0.89Si0.11 (Fe-6wt% Si) alloy was measured at pressures from 45 to 84 GPa and temperatures of 300 and 1800 K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond-anvil cells (DACs). The compressional velocity (νP) and density (ρ) of the Fe-Si alloy are observed to follow a linear relationship at a given temperature. For hcp Fe0.89Si0.11 alloy we found νP = 1.030 (±0.008) × ρ - 1.45 (±0.08) + [3.8 × 10-5(T - 300)×(ρ - 15.37)], including non-negligible temperature dependence. The present results of sound velocity and density of hcp Fe0.89Si0.11 alloy indicates that 3~6 wt% of silicon in the inner core with additional amount of Ni can explain the compressional velocity (νP) and density (ρ) of the "preliminary Earth reference model" (PREM), assuming a temperature of 5500 K and that silicon is the only light element in the inner core.

AB - The sound velocity of hcp Fe0.89Si0.11 (Fe-6wt% Si) alloy was measured at pressures from 45 to 84 GPa and temperatures of 300 and 1800 K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond-anvil cells (DACs). The compressional velocity (νP) and density (ρ) of the Fe-Si alloy are observed to follow a linear relationship at a given temperature. For hcp Fe0.89Si0.11 alloy we found νP = 1.030 (±0.008) × ρ - 1.45 (±0.08) + [3.8 × 10-5(T - 300)×(ρ - 15.37)], including non-negligible temperature dependence. The present results of sound velocity and density of hcp Fe0.89Si0.11 alloy indicates that 3~6 wt% of silicon in the inner core with additional amount of Ni can explain the compressional velocity (νP) and density (ρ) of the "preliminary Earth reference model" (PREM), assuming a temperature of 5500 K and that silicon is the only light element in the inner core.

KW - Birch's law

KW - Fe-Si alloy

KW - High pressure

KW - High temperature

KW - Inelastic X-ray scattering

KW - Inner core

KW - Silicon

KW - Sound velocity

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DO - 10.2138/am-2018-6072

M3 - Article

AN - SCOPUS:85040358618

SN - 0003-004X

VL - 103

SP - 85

EP - 90

JO - American Mineralogist

JF - American Mineralogist

IS - 1

ER -

Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering

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Keywords

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