Oxygen is the key substance for life and one of the most abundant elements on Earth. However, it’s still unknown whether oxygen is present and in which form in the inner core, which is composed of almost pure iron and subject to extreme high pressure and temperature conditions. Now, scientists re
Iron-rich Fe–O compounds at Earth’s core pressures. Credit: Jin Liu
Now, scientists reveal that Fe-rich Fe-O alloys are stable at extreme pressures of nearly 300 GPa and high temperatures of more than 3,000 K . The results prove that oxygen can exist in the solid inner core, which provides key constraints for further understanding of the formation process and evolution history of the Earth’s core. The study, which was co-led by Dr. Jin Liu from HPSTAR and Dr.
However, oxygen, which is closely related to us, is usually excluded from the inner core. This is mainly because Fe-O alloys with iron-rich compositions have never been found in the surface or mantle environments. The oxygen content in all known iron oxides is greater than or equal to 50 atomic percent. Although people have been trying to synthesize iron oxide compounds with iron-rich compositions, such substances have never been found yet.
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