biostudies-literatureMorard GEuropean Research Councile2022JB025117https://www.ebi.ac.uk/biostudies/studies/S-EPMC9788056biostudies-literatureUnknown127(11)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. Liquid density is smoothly evolving between 60 and 150 GPa from values calculated for magnetic liquid to those calculated for non-magnetic liquid, compatibly withJournal of geophysical research. Solid earthStructural and Electronic Transitions in Liquid FeO Under High Pressure.PMC9788056670787724690Rivoldini AChariton SBoulard EGreenberg EMorard GMezouar MAntonangeli DPrescher CMiozzi FBureau HBouchet JBoccato SfalseStructural and Electronic Transitions in Liquid FeO Under High Pressure.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. Liquid density is smoothly evolving between 60 and 150 GPa from values calculated for magnetic liquid to those calculated for non-magnetic liquid, compatibly with2022-01-01T00:00:00Z2022 Nov2025-04-18T22:24:45.301Z2025-04-07T10:10:11.578ZS-EPMC97880563659090310.1029/2022JB025117