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Abstract
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 e-Fe phase, we determine Debye temperatures at pressure up to 300 GPa and temperature over 1000 K. We found that the Grüneisen parameter of e- iron could be described by Anderson’s (1967) equation with parameters γ0 = 1.78(6), q = 0.69(10) with fixed V0 = 6.73 cm3/mol
Received: 1999-5-3
Accepted: 1999-10-11
Published Online: 2015-3-25
Published in Print: 2000-2-1
© 2015 by Walter de Gruyter Berlin/Boston
