Sound velocity of Fe3C at high pressure and high temperature determined by inelastic X-ray scattering

Suguru Takahashi, Eiji Ohtani, Tatsuya Sakamaki, Seiji Kamada, Hiroshi Fukui, Satoshi Tsutsui, Hiroshi Uchiyama, Daisuke Ishikawa, Naohisa Hirao, Yasuo Ohishi, Alfred Q.R. Baron

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The sound velocity of Fe3C was measured at pressures from 33 to 86 GPa and at ambient and high temperatures up to 2300 K using inelastic X-ray scattering (IXS)from laser-heated samples in diamond anvil cells (DACs). The compressional velocity (VP)and density of Fe3C at room temperature were observed to follow a linear relationship (Birch's law). The temperature dependency of Birch's law was not clearly observed and can be ignored. Birch's law for Fe3C is expressed by: VP=1.09±0.14×ρ−1.79±1.26. The result indicates that VP and VS (shear velocity)of the preliminary reference Earth model (PREM)inner core at the Inner Core Boundary (ICB)were by 12% and 48% smaller than those of Fe3C, which could be accounted for by the premelting effect by analogy from pure Fe or by partial melting of the Fe–Fe3C mixture in the inner core.

Original languageEnglish
Pages (from-to)190-196
Number of pages7
JournalComptes Rendus - Geoscience
Issue number2-3
Publication statusPublished - 2019 Feb 1


  • Core
  • FeC
  • High pressure and high temperature
  • Inelastic X-ray scattering
  • Sound velocity

ASJC Scopus subject areas

  • Global and Planetary Change
  • Earth and Planetary Sciences(all)


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