Sound Velocity Measurements of B2-Fe-Ni-Si Alloy Under High Pressure by Inelastic X-Ray Scattering: Implications for the Composition of Earth's Core
Sound Velocity Measurements of B2-Fe-Ni-Si Alloy Under High Pressure by Inelastic X-Ray Scattering: Implications for the Composition of Earth's Core
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DOI：
10.1029/2021gl096405
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发表时间：
2022-08-16
影响因子：
5.2
通讯作者：
Baron, A. Q. R.
中科院分区：
文献类型：
--
作者：
Dominijanni, S.;McCammon, C. A.;Baron, A. Q. R.
B2-Fe0.67Ni0.06Si0.27的弹性性能（15重量%在金刚石对顶砧装置上，采用高分辨非弹性X射线散射和粉末X射线衍射相结合的方法，研究了Si）合金在100 GPa压力下的室温下的非弹性X射线散射和粉末X射线衍射。将密度（ρ）、纵波（V-P）和横波（V-S）速度外推到内核条件，以便与初步参考地球模型进行比较。B2-Fe0.67Ni0.06Si0.27和hcp-Fe-Ni的两相混合物的建模的聚集体压缩波和剪切波速度和密度与基于具有30（5）体积% B2-Fe 0.67Ni 0.06Si 0.27和70（5）体积% hcp Fe-Ni的线性混合模型的V-P、V-V-S和rho的内核PREM值一致，其对应于类似于3-5重量% Si和类似于5-12重量%倪
Elastic properties of B2-Fe0.67Ni0.06Si0.27 (15 wt.% Si) alloy have been investigated by combined high-resolution inelastic X-ray scattering and powder X-ray diffraction in diamond anvil cells up to 100 GPa at room temperature. Densities (rho), compressional (V-P) and shear (V-S) wave velocities were extrapolated to inner core conditions to enable comparison with the preliminary reference Earth model. The modeled aggregate compressional and shear wave velocities and densities of the two-phase mixture of B2-Fe0.67Ni0.06Si0.27 and hcp-Fe-Ni are consistent with inner core PREM values of V-P,V- V-S, and rho based on a linear mixing model with 30(5) vol % B2-Fe0.67Ni0.06Si0.27 and 70(5) vol % hcp Fe-Ni, which corresponds to similar to 3-5 wt.% Si and similar to 5-12 wt.% Ni.