高温高压下液态Fe-8.6 wt%Si的声速和密度:富Si地核的证明  

Soundvelocities and densities of liquid Fe-8.6 wt%Si under high pressure and temperature: Implications for a Si-rich core

作　　者：吴少白 周亮亮 刘勋 黄海军[1] WU Shao-Bai;ZHOU Liang-Liang;LIU Xun;HUANG Hai-Jun(School of Sciences,Wuhan University of Technology,High Pressure Physics and New Materials Research Center,Wuhan 430070,China)

机构地区：[1]武汉理工大学理学院高压物理和新材料研究中心,武汉430070

出　　处：《原子与分子物理学报》2024年第6期92-102,共11页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(42274124)。

摘　　要：在前人的研究基础上,我们建立了新的热力学模型来计算高温高压下液态Fe和Fe-8.6 wt%Si(简称Fe-8.6Si)的状态方程(EOS)和纵波声速(VP).计算结果与静高压和动高压实验测量的EOS和VP一致.在外地核环境下,液态Fe-8.6 Si的EOS和VP同时与外地核的地震波数据一致.如果Si是外地核中唯一的轻元素,其含量不超过7.6~8.6 wt%.Based on previous studies, we established a thermodynamic model to calculate the equation of state (EOS ) and longitudinal sound velocity ( V P ) for liquid Fe and Fe-8.6Si under high temperature and pressure. The calculated EOSs and V P are consistent with measurements by static and dynamic compressions. Under the outer core conditions, EOS and V P of liquid Fe-8.6Si simultaneously match the seismic data of the Earth’s outer core. If Si is the only light element, its maximum concentration in the outer core is estimated to be 7.6~8.6 wt%.

关 键 词：FE-SI 声速 高温高压 地核 

分 类 号：P311[天文地球—固体地球物理学]