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Equation of State of Liquid Iron under Extreme Conditions

Abstract : The density of liquid iron has been determined up to 116 GPa and 4350 K via static compression experiments following an innovative analysis of diffuse scattering from liquid. The longitudinal sound velocity was also obtained to 45 GPa and 2700 K based on inelastic x-ray scattering measurements. Combining these results with previous shock-wave data, we determine a thermal equation of state for liquid iron. It indicates that the Earth’s outer core exhibits 7.5–7.6% density deficit, 3.7–4.4% velocity excess, and an almost identical adiabatic bulk modulus, with respect to liquid iron.
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Submitted on : Tuesday, June 2, 2020 - 8:52:57 AM
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yasuhiro Kuwayama, Guillaume Morard, yoichi Nakajima, Kei Hirose, Alfred Q R Baron, et al.. Equation of State of Liquid Iron under Extreme Conditions. Physical Review Letters, American Physical Society, 2020, 124 (16), ⟨10.1103/PhysRevLett.124.165701⟩. ⟨hal-02732910⟩



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