Hydrogenation of FeSi under high pressure

Hidenori Terasaki, Yuki Shibazaki, Tatsuya Sakamaki, Ryuji Tateyama, Eiji Ohtani, Ken Ichi Funakoshi, Yuji Higo

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Hydrogen is the most abundant element in the solar system, suggesting that hydrogen is one of the plausible light elements in the planetary cores. To investigate the solubility of hydrogen into FeSi and phase relations of the FeSi-H system under high pressure, we performed in situ X-ray diffraction experiments on the FeSi-H and FeSi systems at high pressure and high temperature. Hydrogen starts to dissolve in FeSi (hydrogenation) and form FeSiHx with cubic B20 structure above 10 GPa. Hydrogen content (x), estimated from the volume difference between the FeSi-H and FeSi systems, increases from 0.07 to 0.22 with increasing pressure for P > 10 GPa. Comparing the present results with hydrogenation pressure of Fe, presence of Si in metal increases the minimal pressure for H incorporation. Hydrogen, therefore, can only incorporate into the Fe-Si core at the deeper part (P > 10 GPa) in the planetary interior.

Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalAmerican Mineralogist
Volume96
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1

Keywords

  • Core
  • FeSi
  • High pressure
  • Hydrogen

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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