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Phonon Density of States and Compression Behavior in Iron Sulfide under Pressure Hisao Kobayashi*
 

Summary: Phonon Density of States and Compression Behavior in Iron Sulfide under Pressure
Hisao Kobayashi*
Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297, Japan
and Department of Physics, Tohoku University, Sendai, 980-8578, Japan
Takashi Kamimura
Department of Physics, Tohoku University, Sendai, 980-8578, Japan
Dario Alfe`
Department of Earth Sciences and Department of Physics and Astronomy, University of College London,
London WC1E 6BT, United Kingdom
Wolfgang Sturhahn, Jiyong Zhao, and Esen E. Alp
Experimental Facilities Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
(Received 23 March 2004; published 4 November 2004)
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.
DOI: 10.1103/PhysRevLett.93.195503 PACS numbers: 63.20.­e, 71.30.+h, 76.80.+y, 91.60.Gf

  

Source: Alfè, Dario - Departments of Earth Sciences & Physics and Astronomy, University College London

 

Collections: Physics; Geosciences