Hydrogenation Reactions in Iron-Light Element Systems at High Temperature and High Pressure

Le résumé fourni par la source

The Earth’s core contains nonnegligible concentrations of light elements, reducing the density of the iron core. The hydrogen-induced volume expansion of iron and related materials is key to clarify the chemical composition of the core. This article reviews recent advances on the hydrogenation reactions of Si-bearing iron and FeS through in-situ X-ray diffraction and neutron diffraction measurements at high-pressure and high-temperature conditions. The hydrogen-induced volume expansion of hcp Fe0.95Si0.05 is 10 % greater than the pure iron and the estimated hydrogen content in the core is about a half of that without the effect of silicon. Stoichiometric FeS (troilite) was hardly hydrogenated, suggesting that the hydrogenation reactions of FeS strongly depend on the stoichiometry of FeS.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.