The structure of Fe-Ni alloy in Earth's inner core

Shigehiko Tateno, Kei Hirose, Tetsuya Komabayashi, Haruka Ozawa, Yasuo Ohishi

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38 Citations (Scopus)

Abstract

The crystal structure of Fe-10%Ni was investigated up to 340GPa and 4700K, corresponding to the Earth's inner core conditions by synchrotron X-ray diffraction measurements in-situ at ultrahigh pressure and temperature in a laser-heated diamond-anvil cell. The results show that hexagonal closed-packed (hcp) structure is stable throughout the experimental conditions investigated with no evidence for a phase transition to body-centered cubic (bcc) or face-centered cubic (fcc) phases. The axial c/a ratio of the hcp crystal obtained around 330GPa has a small temperature dependence similar to the axial ratio of pure Fe. Iron alloy with less than 10% Ni crystallizes to an hcp structure with c/a ratio of ∼1.61 at inner core conditions, although the effect of small amount of light elements remains to be examined by experiments.

Original languageEnglish
Article numberL12305
JournalGeophysical Research Letters
Volume39
Issue number12
DOIs
Publication statusPublished - Jun 28 2012

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Tateno, S., Hirose, K., Komabayashi, T., Ozawa, H., & Ohishi, Y. (2012). The structure of Fe-Ni alloy in Earth's inner core. Geophysical Research Letters, 39(12), [L12305]. https://doi.org/10.1029/2012GL052103