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July 28, 2026Earth and Planetary Science LettersOpen Access

Experiments and thermodynamic modelling on Fe-FeH phase diagram under high pressures: Implications for Earth’s core composition and temperature

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Authors

STShoh TagawaLife Science InstituteSFSuyu FuThe University of TokyoGHGeorge HelffrichTokyo Institute of Technology

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Overview

Randomized trial investigates core composition and temperature in terrestrial planets, indicating hydrogen's significance.

Key Points

  • This research aims to understand the Fe-FeH phase diagram under high pressures to inform on the composition and temperature of Earth's core.
  • Conducted high-pressure experiments on the Fe-FeH system up to 330 GPa.
  • Performed melting and subsolidus experiments using a laser-heated diamond-anvil cell.
  • Employed thermodynamic modelling integrating current and past experimental data.
  • Identified a higher eutectic temperature at 330 GPa compared to previous melting curve reports.
  • Determined a concentration-dependent partition coefficient of hydrogen between hcp-Fe and liquid.
  • Revealed a non-linear relationship between hydrogen concentration and melting temperature depression.

Cite This Study

Tagawa et al. (2026) studied this question.

synapsesocial.com/papers/6a685d012845b684d16f079chttps://doi.org/10.1016/j.epsl.2026.120243
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  1. 1Iron hydride FeHx in the Earth's inner core and its geophysical implications2024
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  3. 3Hydrogen in the Earth's Outer Core From Density Measurements of Liquid Fe‐H up to 102 GPa and 4,100 K2025 · 2 citations
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  5. 5Radial gradient of superionic hydrogen in the Earth’s inner core2026