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Gruneisen parameter of -iron up to 300 GPa from in-situ X-ray study

L.S. Dubrovinsky^1,*, S.K. Saxena^1,, N.A. Dubrovinskaia¹, S. Rekhi¹ and T. Le Bihan²

¹ Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden
² European Synchrotron Radiation Facility, Grenoble 38043, France

Correspondence: ^* E-mail:Leonid.Dubrovinsky{at}geo.uu.se

We show that high-quality powder X-ray diffraction data, collected in diamond anvil cells, provide sufficient information for Rietveld refinement and determination of temperature factors. For the first time using a new method based on combination of thermal equation of state and measured mean-square atomic vibrations of high-pressure -Fe phase, we determine Debye temperatures at pressure up to 300 GPa and temperature over 1000 K. We found that the Grüneisen parameter of -iron could be described by Anderson’s (1967) equation with parameters ₀ = 1.78(6), q = 0.69(10) with fixed V₀ = 6.73 cm³/mol.

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