title: Phonon density of states and compression behavior in iron sulfide under pressure.
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.
authors.affiliation: Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297, Japan.
authors.forename: Hisao
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamimura
authors.forename: Dario
authors.initials: D
authors.lastname: Alfè
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Sturhahn
authors.forename: Jiyong
authors.initials: J
authors.lastname: Zhao
authors.forename: Esen E
authors.initials: EE
authors.lastname: Alp