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This review aims to summarize recent advances in understanding the behavior of hydrogen in deep Earth materials under high-pressure conditions.

June 29, 2026High Pressure ResearchOpen Access

Structure and properties of deep Earth materials containing light elements under high pressure

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Review summarizes advances in high-pressure hydrogen-bearing materials affecting Earth's interior.

This review aims to summarize recent advances in understanding the behavior of hydrogen in deep Earth materials under high-pressure conditions.
Utilized neutron and synchrotron X-ray diffraction alongside vibrational spectroscopy.
Investigated hydrogen bonding and site occupancies in materials related to the Earth's mantle and core.
Conducted high-pressure experiments using the PLANET beamline at J-PARC.
Neutron diffraction revealed hydrogen-induced volume expansion is greater in Fe–Ni and Fe–Si alloys than in pure iron.
Pressure responses of hydrogen bonds in dense hydrous magnesium silicates and hydroxides were clarified, impacting deep-Earth water transport.
High-pressure organic compound studies indicated pathways for molecular evolution through processes like polymerization and peptide formation.

Hiroyuki Kagi (2026) studied this question.

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