Experimental indications of superionic behaviour in iron hydride under Earth’s core conditions

Nature Geoscience, Published online: 09 June 2026; doi:10.1038/s41561-026-02001-5 Iron hydride in the Earth’s inner core may exist in a superionic state, according to high-pressure and high-temperature experiments at relevant conditions. Accompanying slow diffusion suggests that the inner core could retain hydrogen on geologic timescales.