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Superstoichiometric Alloying of H and Close‐Packed Fe‐Ni Metal Under High Pressures: Implications for Hydrogen Storage in Planetary Core

https://doi.org/10.1029/2022GL101155

Piet, Hélène; Chizmeshya, Andrew; Chen, Bin; Chariton, Stella; Greenberg, Eran; Prakapenka, Vitali; Buseck, Peter; Shim, Sang‐Heon (March 2023, Geophysical Research Letters)

Abstract Although high pressure enables alloying between hydrogen and iron, hydrogen‐to‐iron molar ratio (H/Fe) so far found in experiments is mostly limited to 1 in the close‐packed iron metal under high pressure. We report a H/(Fe + Ni) ratio of 1.8 ± 0.1 from (Fe,Ni)H_x(orx ≥ 1.8) quenched from liquid, exceeding the amounts so far reported for densely packed Fe alloys. From the metastable behavior of the frozen (Fe,Ni)H_xliquid during decompression, we infer that the amount is a lower bound and therefore even a greater amount of H can be dissolved in the liquid part of Fe‐rich cores of planets. The significant H storage capacity of liquid Fe‐Ni alloy is important to consider for potential storage of H in the interiors of low‐density planets as well as rocky planets.
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Core origin of seismic velocity anomalies at Earth’s core–mantle boundary

https://doi.org/10.1038/s41586-023-05713-5

Fu, Suyu; Chariton, Stella; Prakapenka, Vitali B.; Shim, Sang-Heon (March 2023, Nature)

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Hydrogen Solubility in FeSi Alloy Phases at High Pressures and Temperatures

https://doi.org/10.2138/am-2022-8295

S. Fu; S. Chariton; V. B. Prakapenka; A. Chizmeshya; S.-H. Shim (October 2022, American Mineralogist)

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Stable hexagonal ternary alloy phase in Fe-Si-H at 28.6–42.2 GPa and 3000 K

https://doi.org/10.1103/PhysRevB.105.104111

Fu, Suyu; Chariton, Stella; Prakapenka, Vitali B.; Chizmeshya, Andrew; Shim, Sang-Heon (March 2022, Physical Review B)

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Effect of nickel on the high-pressure phases in FeH

https://doi.org/10.1103/physrevb.104.224106

Piet, Helene; Chizmeshya, Andrew V.; Chen, Bin; Chariton, Stella; Greenberg, Eran; Prakapenka, Vitali B.; Shim, Sang-Heon (December 2021, Physical Review B)

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Effects of Hydrogen on the Phase Relations in Fe‐FeS at Pressures of Mars‐Sized Bodies

https://doi.org/10.1029/2021JE006942

Piet, H.; Leinenweber, K.; Greenberg, E.; Prakapenka, V. B.; Shim, S.‐H. (November 2021, Journal of Geophysical Research: Planets)

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