Aggregate sound velocities and acoustic Grüneisen parameter of iron up to 300 GPa and 1,200 K
- *Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden; and ‡European Synchrotron Radiation Facility, Grenoble 38043, France
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Edited by Ho-Kwang Mao, Carnegie Institution of Washington, Washington, DC, and approved June 11, 2001 (received for review December 8, 2000)
Abstract
Successful interpretation of available geophysical data requires experimental and theoretical information on the elasticity of solids under physical conditions of Earth's interior. Because iron is considered as major component in Earth's core, elastic properties of iron at high pressures and temperatures are very important for modeling its composition and dynamics. We use in situ x-ray diffraction data on ɛ-iron at static pressures up to 300 GPa and temperatures to 1,200 K to determine the Debye–Waller temperature factors and calculate aggregate sound velocities and Grüneisen parameter of ɛ-iron by using an approach that is based on Rietveld refinement at high pressures and temperatures.
Footnotes
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↵ † To whom reprint requests should be addressed. E-mail: Leonid.Dubrovinsky{at}geo.uu.se.
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This paper was submitted directly (Track II) to the PNAS office.
- Abbreviation:
- DAC,
- diamond anvil cells
- Copyright © 2001, The National Academy of Sciences
