Melting phase relations in Fe-Si-H at high pressure and implications for Earth's inner core crystallization.

ABSTRACT: Hydrogen could be an important light element in planetary cores, but its effect on phase diagrams of iron alloys is not well known because the solubility of H in Fe is minimal at ambient pressure and high-pressure experiments on H-bearing systems have been challenging. Considering that silicon can be another major light element in planetary cores, here we performed melting experiments on the Fe-Si-H system at ~ 50 GPa and obtained the ternary liquidus phase relations and the solid/liquid partition coefficient, D of Si and H based on in-situ high-pressure X-ray diffraction measurements and ex-situ chemical and textural characterizations on recovered samples. Liquid crystallized hexagonal close-packed (hcp) (Fe_0.93Si_0.07)H_0.25, which explains the observed den

SUBMITTER: Hikosaka K 

PROVIDER: S-EPMC9200858 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature