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
吴少白 1周亮亮 1刘勋 1黄海军1
作者信息
- 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
- 折叠
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％.
Abstract
Based on previous studies,we established a thermodynamic model to calculate the equation of state(EOS)and longitudinal sound velocity(VP)for liquid Fe and Fe-8.6Si under high temperature and pressure.The calculated EOSs and VP are consistent with measurements by static and dynamic compressions.Under the outer core conditions,EOS and VP of liquid Fe-8.6Si simultaneously match the seismic data of the Earth's out-er 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Key words
Fe-Si/Sound velocity/High temperature and pressure/Earth's core引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据