Iron-rich Fe-O compounds at Earth's core pressures.

ABSTRACT: Oxygen and iron are the most abundant elements on Earth, and their compounds are key planet-forming components. While oxygen is pervasive in the mantle, its presence in the solid inner core is still debatable. Yet, this issue is critical to understanding the co-evolution and the geomagnetic field generation. Thus far, iron monoxide (FeO) is the only known stoichiometric compound in the Fe-FeO system, and the existence of iron-rich Fe _n O compounds has long been speculated. Here, we report that iron reacts with FeO and Fe₂O₃ at 220-260 GPa and 3000-3500 K in laser-heated diamond anvil cells. Ab initio structure searches using the adaptive genetic algorithm indicate that a series of stable stoichiometric Fe _n O compounds (with

SUBMITTER: Liu J 

PROVIDER: S-EPMC9707061 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature