Guillaume Morard, Daniele Antonangeli, Johann Bouchet, Attilio Rivoldini, Silvia Boccato, Francesca Miozzi, Eglantine Boulard, Hélène Bureau, Mohamed Mezouar, Clemens Prescher, Stella Chariton, Eran Greenberg
FeO represents an important end-member for planetary interiors mineralogy. However, its properties in the liquid state under high pressure are poorly constrained. Here, in situ high-pressure and high-temperature X-ray diffraction experiments, ab initio simulations, and thermodynamic calculations are combined to study the local structure and density evolution of liquid FeO under extreme conditions. Our results highlight a strong shortening of the Fe-Fe distance, particularly pronounced between ambient pressure and ∼40 GPa, possibly related with the insulator to metal transition occurring in solid FeO over a similar pressure range...
November 2022: Journal of Geophysical Research. Solid Earth