Equation of state of Fe3S at room temperature up to 2megabars

Seiji Kamada, Eiji Ohtani, Hidenori Terasaki, Takeshi Sakai, Suguru Takahashi, Naohisa Hirao, Yasuo Ohishi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The equation of state of Fe3S was investigated up to 200GPa at room temperature using a diamond anvil cell. Fe3S adopts a tetragonal structure up to 200GPa and no phase transition was observed. The fourth-order Birch-Murnaghan equation of state (EOS) was fitted to present compression data at room temperature. The elastic parameters, such as bulk modulus (K0), its pressure derivative (K0'), and K0″(dK'/dP) were determined to be 122.4(50)GPa, 5.36(48), and -0.066(30)GPa-1, respectively by fixing the zero pressure volume, V0, to be 377Å3. Based on fourth-order Birch-Murnaghan EOS of Fe3S, the maximum amount of S in the inner core was estimated to be 11.4(14)at.% based on the density deficit of the inner core.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalPhysics of the Earth and Planetary Interiors
Publication statusPublished - Mar 2014
Externally publishedYes


  • Birch-Murnaghan equation of state
  • Diamond anvil cell
  • In situ X-ray diffraction
  • Inner core

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science


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