Equation of State of Liquid Iron under Extreme Conditions

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. Comb...

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Bibliographic Details
Published in:Physical review letters 2020-04, Vol.124 (16), p.165701-165701, Article 165701
Main Authors: Kuwayama, Yasuhiro, Morard, Guillaume, Nakajima, Yoichi, Hirose, Kei, Baron, Alfred Q R, Kawaguchi, Saori I, Tsuchiya, Taku, Ishikawa, Daisuke, Hirao, Naohisa, Ohishi, Yasuo
Format: Article
Language:English
Subjects:
Acoustic velocity
Bulk modulus
Density
Earth core
Earth Sciences
Equations of state
Geophysics
Inelastic scattering
Iron
Sciences of the Universe
Shock waves
X-ray scattering
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Summary: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 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.124.165701