Crystal structure of iron at the center of the Earth

Shigehiko Tateno

Research output: Contribution to journalReview article

Abstract

The inner core, most remote part of our planet, is composed of solid iron. Because the relevant ultrahigh pressure and temperature conditions were only accessible by dynamical shock-wave compression experiments, the crystal structure of iron at the inner core has long been under debate. Our first static experiments show that the hexagonal close-packed (hcp) structure is a stable form of iron up to 377 GPa and 5700 K, 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 cause inner core seismic anisotropy.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume21
Issue number2
DOIs
Publication statusPublished - Aug 11 2011

Keywords

  • Core
  • Diamond-anvil cell
  • Iron

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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