Equation of State of Liquid Iron under Extreme Conditions
Yasuhiro Kuwayama, G. Morard, Yoichi Nakajima, Kei Hirose, Alfred Q. R. Baron, Saori I. Kawaguchi, Taku Tsuchiya, Daisuke Ishikawa, Naohisa Hirao, Yasuo Ohishi
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 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.
Topics & Concepts
Adiabatic processEquation of statePhysicsScatteringBulk modulusShock (circulatory)Materials scienceCompression (physics)Atomic physicsThermodynamicsCondensed matter physicsOpticsMedicineInternal medicineHigh-pressure geophysics and materialsGeological and Geochemical AnalysisEarthquake Detection and Analysis