Sound Velocity of Liquid Fe-P at High Pressure

被引：6

作者：

Kinoshita, Daisuke ^{[1
]}

Nakajima, Yoichi ^{[1
,2
]}

Kuwayama, Yasuhiro ^{[2
,3
]}

Hirose, Kei ^{[3
,4
]}

Iwamoto, Asaki ^{[1
]}

Ishikawa, Daisuke ^{[2
,5
]}

Baron, Alfred Q. R. ^{[2
]}

机构：

[1] Kumamoto Univ, Dept Phys, Kumamoto 8608555, Japan

[2] RIKEN SPring 8 Ctr, Mat Dynam Lab, Mikazuki, Hyogo 6795148, Japan

[3] Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan

[4] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan

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

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2020年 / 257卷 / 11期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

Earth' s core; high pressure; inelastic X-ray scattering; liquid Fe alloys; phosphorus content; sound velocity; OUTER CORE CONDITIONS; DENSITY-MEASUREMENTS; IRON; EARTHS; ALLOYS; BEHAVIOR; STATE;

D O I：

10.1002/pssb.202000171

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The longitudinal sound wave (P-wave) velocity of liquid Fe75P25 alloy is determined up to 60 GPa using inelastic X-ray scattering with laser-heated diamond anvil cell. Phosphorus is found to have negligible effect on the P-wave velocity of liquid Fe under high-pressure conditions. Based on the P-wave and pressure data, an adiabatic Murnaghan equation of state for liquid Fe75P25 is constructed, yielding to the adiabatic bulk modulus K-S0 = 94.9 +/- 7.1 GPa and its pressure derivative K'(S) = 3.56 +/- 0.18, respectively, at 1 bar with the density of 5.94 g cm(-3) at 2000 K. The addition of phosphorus decreases the bulk modulus and density of liquid Fe under high-pressure conditions, which minimizes the effect on the velocity. Using the equation of state, the P-wave velocity and density of liquid Fe75P25 are estimated under Earth's liquid outer core conditions. Comparison with seismological observations suggests an upper limit of phosphorus in liquid core of 14.6 +/- 3.9 wt%.

引用

页数：7

共 34 条

[31] The properties of iron under core conditions from first principles calculations [J].