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Updated: Aug 9, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 8, 2013
Phonon density of states and compression behavior in iron sulfide under pressure
Hisao Kobayashi1, Takashi Kamimura, Dario Alfè
1Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297, Japan.
Abstract:
We report the partial phonon densities of states (DOS) of iron sulfide, a possible component of the rocky planet's core, measured by the 57Fe nuclear resonant inelastic x-ray scattering and calculate the total phonon DOS under pressure. From the phonon DOS, we drive thermodynamic parameters. A comparison of the observed and estimated compressibilities makes it clear that there is a large pure electronic contribution in the observed compressibility in the metallic state. Our results present the observation of thermodynamic parameters of iron sulfide with the low-spin state of an Fe2+ ion at the high density, which is similar to the condition of the Martian core.
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