Hydrogen in molten iron at high pressure: The first measurement

Takuo Okuchi, Eiichi Takahashi

Research output: Chapter in Book/Report/Conference proceedingChapter

6 Citations (Scopus)

Abstract

In order to evaluate hydrogen abundance in the Earth’s core, high-pressure melting experiments of FeHx were carried out. The experiments were designed to simulate the iron-water reaction in the Earth’s magma ocean so that FeHx was synthesized in hydrous silicate melts. Hydrogen concentration in liquid FeHx was measured for the first time with a new technique. The hydrogen concentration in the liquid FeHx was 20% higher than the coexisting solid FeHx. The hydrogen concentration in the liquid FeHx rapidly increased with increasing temperature. The accreted iron to the proto-Earth should have accumulated and have been in equilibrium with hydrous silicate melt at the bottom of the magma ocean. Hydrogen concentration in the core estimated from the result of our experiments was up to H/Fe = 0.69, which may reconcile most of the density deficit in the present outer core.

Original languageEnglish
Title of host publicationProperties of Earth and Planetary Materials at High Pressure and Temperature, 1998
EditorsMurli H. Manghnani, Takehiko Yagi
PublisherBlackwell Publishing Ltd
Pages249-260
Number of pages12
ISBN (Electronic)9781118664421
ISBN (Print)9780875900834
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

Publication series

NameGeophysical Monograph Series
Volume101
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

ASJC Scopus subject areas

  • Geophysics

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  • Cite this

    Okuchi, T., & Takahashi, E. (1997). Hydrogen in molten iron at high pressure: The first measurement. In M. H. Manghnani, & T. Yagi (Eds.), Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998 (pp. 249-260). (Geophysical Monograph Series; Vol. 101). Blackwell Publishing Ltd. https://doi.org/10.1029/GM101p0249