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Phonon Density of States of Iron Up to 153 Gigapascals

Phonon Density of States of Iron Up to 153 Gigapascals

H K Mao, J Xu, V V Struzhkin, J Shu, R J Hemley, W Sturhahn, M Y Hu, E E Alp, L Vocadlo, D Alfè, G D Price, M J Gillan, M Schwoerer-Böhning, D Häusermann, P Eng, G Shen, H Giefers, R Lübbers, G Wortmann

Science. 2001 May 4;292(5518):914-6.

PMID: 11340201

Abstract:

We report phonon densities of states (DOS) of iron measured by nuclear resonant inelastic x-ray scattering to 153 gigapascals and calculated from ab initio theory. Qualitatively, they are in agreement, but the theory predicts density at higher energies. From the DOS, we derive elastic and thermodynamic parameters of iron, including shear modulus, compressional and shear velocities, heat capacity, entropy, kinetic energy, zero-point energy, and Debye temperature. In comparison to the compressional and shear velocities from the preliminary reference Earth model (PREM) seismic model, our results suggest that Earth's inner core has a mean atomic number equal to or higher than pure iron, which is consistent with an iron-nickel alloy.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS76616	Iron-nickel alloy			Price

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