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- Title
Iron Hydride in the Earth's Inner Core and Its Geophysical Implications.
- Authors
Yang, Hua; Muir, Joshua M. R.; Zhang, Feiwu
- Abstract
Hydrogen is potentially a key light element in the Earth's core. Determining the stability of iron hydride is essential for Earth's core mineralogy applications. We investigated the thermal stabilities of a range of Fe‐H binaries at core P‐T conditions. It is concluded that face‐centered cubic phase FeH is stable in the Earth's inner core. The high mobility of hydrogen in the Fe lattice suggests that hydrogen is transferred to a superionic state under the inner core conditions, where the superionic state transfer temperature of H in Fe fcc lattice is ∼500 K higher than that in hcp Fe system. The H concentration in the inner core is estimated to be ∼0.92 wt% to explain its density deficit, this value was further constrained to ∼0.21 wt% by matching the density jump at the inner‐core boundary. H alongside other light elements are required to account for the geophysical observations of the Earth's inner core. Key Points: Fcc phase FeH was found to be stable under inner core conditionsH is superionic in both fcc and hcp lattices at inner core temperature but the transition temperature is 500 K higher in the fcc systemThe H concentration in the inner core has been constrained to be ∼0.21 wt% by matching the density jump at the inner‐core boundary
- Subjects
EARTH'S core; HYDRIDES; GEOPHYSICAL observations; LIGHT elements; TRANSITION temperature; IRON
- Publication
Geochemistry, Geophysics, Geosystems: G3, 2022, Vol 23, Issue 12, p1
- ISSN
1525-2027
- Publication type
Article
- DOI
10.1029/2022GC010620