Phonon density of states and compression behavior in iron sulfide under pressure.

Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297, Japan.
Physical Review Letters (Impact Factor: 7.73). 12/2004; 93(19):195503. DOI: 10.1103/PhysRevLett.93.195503
Source: PubMed

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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May 22, 2014