The structure of iron in earth's inner core

Shigehiko Tateno, Kei Hirose, Yasuo Ohishi, Yoshiyuki Tatsumi

Research output: Contribution to journalArticle

261 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

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    Tateno, S., Hirose, K., Ohishi, Y., & Tatsumi, Y. (2010). The structure of iron in earth's inner core. Science, 330(6002), 359-361. https://doi.org/10.1126/science.1194662