Stability field of the hcp-structure for Fe, Fe-Ni, and Fe-Ni-Si alloys up to 3 Mbar

Takeshi Sakai, Eiji Ohtani, Naohisa Hirao, Yasuo Ohishi

研究成果: Article査読

57 被引用数 (Scopus)

抄録

The phase relations of Fe, Fe90Ni10 and Fe 87.9Ni4.4Si7.7 were investigated up to 273(6) GPa and 4490(560) K, 250(19) GPa and 2730(110) K and 304(3) GPa and 2780(210) K, respectively, and the hexagonal close-packed structure was found to be stable in all of these compounds under the pressure and temperature conditions studied. We did not observe other phases such as a body-centered cubic structure. The axial ratio (c/a) of Fe87.9Ni4.4Si7.7 at 300 GPa showed an almost constant value of 1.593-1.596 against temperature. The weak temperature dependency of the axial ratio of hcp-Fe-Ni-Si alloy indicates that the c-axis is still harder than the a-axis at high temperature condition. Therefore the alignment of hcp-Fe-Ni-Si alloy with the c-axis parallel to the Earth's rotation axis could account for the observation of the seismic wave anisotropy of the inner core.

本文言語English
論文番号L09302
ジャーナルGeophysical Research Letters
38
9
DOI
出版ステータスPublished - 2011 5月 16

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

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