Experimental vibrational Grüneisen ratio values for ɛ-iron up to 330 GPa at 300 K

Details Experimental vibrational Grüneisen ratio values for ɛ-iron up to 330 GPa at 300 K Experimental vibrational Grüneisen ratio values for ɛ-iron up to 330 GPa at 300 K

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..399a&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 2, p. 399-402

Physics

16

Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Tectonophysics: Core Processes, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

Experimental values for the vibrational Grüneisen ratio, γv, for hexagonal close-packed (hcp) iron, called epsilon (ɛ)-iron, were obtained over a large compression range corresponding to Earth's inner-core pressure. This was done by measuring the intensity change in x-ray diffraction lines under pressure, P. X-ray structural refinement using the Rietveld method on powder diffraction data yielded information on mean square displacement used to obtain the Debye temperature, Θ, as a function of compression, V/V0. The value of Θ was determined from the measured intensity of the diffraction lines, which arises from the mean squared amplitude measured in-situ in the diamond cell. From the Debye relationship, γv=-(∂lnΘ/∂lnV)T, we determined experimental data on γv versus V of Fe (hcp) up to 330 GPa at 300 K. The measured value of γv(V) is 1.18 at 330 GPa and 1.41 at 135 GPa.

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