The structure of iron in earth's inner core

Shigehiko Tateno, Kei Hirose, Yasuo Ohishi, Yoshiyuki Tatsumi

    Research output: Contribution to journalArticlepeer-review

    287 Citations (Scopus)

    Abstract

    Earth's solid inner core is mainly composed of iron (Fe). Because the relevant ultrahigh pressure and temperature conditions are difficult to produce experimentally, the preferred crystal structure of Fe at the inner core remains uncertain. Static compression experiments showed that the hexagonal close-packed (hcp) structure of Fe is stable up to 377 gigapascals and 5700 kelvin, corresponding to inner core conditions. The observed weak temperature dependence of the c/a axial ratio suggests that hcp Fe is elastically anisotropic at core temperatures. Preferred orientation of the hcp phase may explain previously observed inner core seismic anisotropy.

    Original languageEnglish
    Pages (from-to)359-361
    Number of pages3
    JournalScience
    Volume330
    Issue number6002
    DOIs
    Publication statusPublished - Oct 15 2010

    ASJC Scopus subject areas

    • General

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