Sound velocity of liquid Fe-Ni-S at high pressure

被引：31

作者：

Kawaguchi, Saori I. ^{[1
,2
,3
]}

Nakajima, Yoichi ^{[4
,5
]}

Hirose, Kei ^{[2
]}

Komabayashi, Tetsuya ^{[1
,6
,7
]}

Ozawa, Haruka ^{[2
,8
]}

Tateno, Shigehiko ^{[2
,8
]}

Kuwayama, Yasuhiro ^{[9
]}

Tsutsui, Satoshi ^{[3
]}

Baron, Alfred Q. R. ^{[3
,4
]}

机构：

[1] Tokyo Inst Technol, Dept Earth & Planetary Sci, Tokyo, Japan

[2] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo, Japan

[3] Japan Synchrotron Radiat Res Inst, Kouto, Hyogo, Japan

[4] RIKEN, Mat Dynam Lab, Sayo, Japan

[5] Kumamoto Univ, Prior Org Innovat & Excellence, Kumamoto, Japan

[6] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland

[7] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh, Midlothian, Scotland

[8] Okayama Univ, Inst Planetary Mat, Tottori, Japan

[9] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime, Japan

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH | 2017年 / 122卷 / 05期

关键词：

sound velocity; Earth's outer core; liquid Fe-Ni-S alloys; high pressure; inelastic X-ray scattering; EQUATION-OF-STATE; OUTER CORE; TEMPERATURE-DEPENDENCE; DENSITY-MEASUREMENTS; IRON; SULFUR; METALS; CONSTRAINTS; EARTH; MARS;

D O I：

10.1002/2016JB013609

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The sound velocity of liquid Fe47Ni28S25 and Fe63Ni12S25 was measured up to 52GPa/2480K in externally resistance-heated and laser-heated diamond-anvil cells using high-resolution inelastic X-ray scattering. From these experimental data, we obtained the elastic parameters of liquid Fe47Ni28S25, K-S0=96.12.7GPa and K-S0=4.000.13, where K-S0 and K-S0 are the adiabatic bulk modulus and its pressure derivative at 1bar, when the density is fixed at (0)=5.620.09g/cm(3) for 1bar and 2000K. With these parameters, the sound velocity and density of liquid Fe47Ni28S25 were calculated to be 8.41 +/- 0.17km/s and 8.93 +/- 0.19 to 9.10 +/- 0.18g/cm(3), respectively, at the core mantle boundary conditions of 135GPa and 3600-4300K. These values are 9.4% higher and 17-18% lower than those of pure Fe, respectively. Extrapolation of measurements and comparison with seismological models suggest the presence of 5.8-7.5wt % sulfur in the Earth's outer core if it is the only light element.

引用

页码：3624 / 3634

页数：11

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