Soundvelocities and densities of liquid Fe-8.6 wt％Si under high pressure and temperature:Implications for a Si-rich core
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％.
Fe-SiSound velocityHigh temperature and pressureEarth's core
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