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It brings outstanding material properties not only originating from its own loosely bounded characteristics but also serving as a quasiatom, which even chemically interacts with other elemental ions. In elemental metals, electride transitions have been reported in alkali metals where valence electrons can easily gain enough kinetic energy to escape nuclei. However, there are few studies on transition metals. Especially iron, the key element of human technology and geophysics, has not been studied in respect of electride formation. In this study, it is demonstrated that electride formation drives the superionic state in iron hydride under high\u2010pressure conditions of the earth's inner core. The electride stabilizes the iron lattice and provides a pathway for hydrogen diffusion by severing the direct interaction between the metal and the volatile element. The coupling between lattice stability and superionicity is triggered near 100\u00a0GPa and enhanced at higher pressures. It is shown that the electride\u2010driven superionicity can also be generalized for metal electrides and other rocky planetary cores by providing a fundamental interaction between the electride of the parent metal and doped light elements.<\/jats:p>","DOI":"10.1002\/advs.202308177","type":"journal-article","created":{"date-parts":[[2024,4,12]],"date-time":"2024-04-12T03:19:48Z","timestamp":1712891988000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Electride Formation of HCP\u2010Iron at High Pressure: Unraveling the Origin of the Superionic State of Iron\u2010Rich Compounds in Rocky Planets"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0161-711X","authenticated-orcid":false,"given":"Ina","family":"Park","sequence":"first","affiliation":[{"name":"Department of Chemistry Pohang University of Science and Technology  Pohang 37673 Republic of 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