High‐Temperature Equation of State of FeH: Implications for Hydrogen in Earth's Inner Core
High‐Temperature Equation of State of FeH: Implications for Hydrogen in Earth's Inner Core
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FeH 的高温状态方程:对地球内核中氢的影响
DOI:
10.1029/2021gl096260
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发表时间:
2022
影响因子:
5.2
通讯作者:
Ohishi Yasuo
中科院分区:
文献类型:
--
作者:
Tagawa Shoh;Gomi Hitoshi;Hirose Kei;Ohishi Yasuo
While hydrogen is one of plausible major light elements in the core, the high‐temperature equation of state (EoS) of Fe‐H alloy has not been experimentally examined to the core pressure range. Here we measured the volume (V) of non‐magnetic (NM) face‐centered cubic (fcc) FeH at high pressure and temperature (P‐T) to 142 GPa and 3660 K in a laser‐heated diamond‐anvil cell and obtained itsP‐V‐TEoS. An increase in the lattice volume of Fe per H atom, ΔVH, determined as functions ofPandTis found to be substantially smaller than the volume of metallic H that has been used to estimate H concentration in Fe‐H alloy. The ΔVHis almost identical between fcc and double hexagonal close‐packed phases in the NM state, suggesting that it may be applicable to hcp. The extrapolation of ΔVHto inner core conditions indicates its maximum H content to be 0.8–0.9 wt%.
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