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\begin{document}

\title{Melting Experiments on Fe-O-H: Evidence for Eutectic Melting in Fe-FeH
and Implications for Hydrogen in the Core}



\author[1]{Kenta Oka}%
\author[2]{Shoh Tagawa}%
\author[2]{Kei Hirose}%
\author[3]{Yasuo Ohishi}%
\affil[1]{Univ. Tokyo}%
\affil[2]{Tokyo Institute of Technology}%
\affil[3]{Japan Synchrotron Radiation Research Institute}%


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  \date{May 16, 2024}


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\begin{abstract}
We examined liquidus phase relations in Fe-O+/-H at \textasciitilde{}40
and \textasciitilde{}150 GPa, and subsolidus phase equilibria in Fe-FeH.
While it has been speculated that Fe and FeH form continuous solid
solution to core pressures, our experiments show the coexistence of the
H-poor hcp and H-rich fcc phases in the Fe-FeH system. Considering
higher melting temperature of stoichiometric FeH than that of Fe-FeH, it
indicates eutectic melting between Fe and FeH. It is consistent with the
liquidus phase diagram in Fe-O-H, which implies the Fe-FeH binary
eutectic liquid composition of FeH0.42 at \textasciitilde{}40 GPa. We
estimated the outer core liquid composition to be Fe + 2.9-5.2\% O +
0.03-0.32\% H + 0-3.4\% Si + 1.7\% S by weight, based on the liquidus
phase relations, solid-liquid partitioning, and outer/inner core
densities and velocities, indicating that O and either H or Si are
important core light elements.%
\end{abstract}%



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