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Oxygen solubility in solid iron is extremely low, even at high pressures andtemperatures. Thus far, no Fe-O compounds between Fe and FeO endmembers havebeen reported experimentally. We observed chemical reactions of Fe with FeO orFe$_2$O$_3$ $in\ situ$ x-ray diffraction experiments at 220-260 GPa and3,000-3,500 K. The refined diffraction patterns are consistent with a series ofFe$_n$O (n $>$ 1) compounds (e.g., Fe$_{25}$O$_{13}$ and Fe$_{28}$O$_{14}$)identified using the adaptive genetic algorithm. Like $\epsilon$-Fe in thehexagonal close-packed (hcp) structure, the structures of Fe$_n$O compoundsconsist of oxygen-only close-packed monolayers distributed between iron-onlylayers. $Ab\ initio$ calculations show systematic electronic properties ofthese compounds that have ramifications for the physical properties of Earth'sinner core.

Iron-rich Fe-O compounds with closest-packed layers at core pressures