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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 113,
B09213,
14 PP., 2008
doi:10.1029/2007JB005229
Experimental determination of the elasticity of iron at high pressure
Department of Geological and Environmental Sciences and Photon Science, SLAC, Stanford University, Stanford, California, USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., USA
SPring-8, RIKEN, Sayo, Japan
SPring-8, JASRI, Sayo, Japan
SPring-8, JASRI, Sayo, Japan
Department of Crystallography, University of Göttingen, Göttingen, Germany
Department of Earth and Planetary Science, University of California, Berkeley, California, USA
HPCAT, Advanced Photon Source, Carnegie Institution of Washington, Washington, D.C., USA
HPCAT, Advanced Photon Source, Carnegie Institution of Washington, Washington, D.C., USA
XOR, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., USA
Department of Geophysical Sciences, University of Chicago, Chicago, Illinois, USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., USA
HPCAT, Advanced Photon Source, Carnegie Institution of Washington, Washington, D.C., USA
We present a multitechnique approach to experimentally determine the elastic anisotropy of polycrystalline hcp Fe at high pressure. Directional phonon measurements from inelastic X-ray scattering on a sample with lattice preferred orientation at 52 GPa in a diamond anvil cell were coupled with X-ray diffraction data to determine the elastic tensor. Comparison of the results from this new method with the elasticity determined by lattice strain analysis of radial X-ray diffraction measurements showed significant differences, highlighting the importance of strength anisotropy in hcp Fe. At 52 GPa, we found that a method which combines results from inelastic scattering and pressure-volume measurements gives a shape in the velocity anisotropy close to sigmoidal (with a faster c and slower a axis) a smaller magnitude in the anisotropy and compared to velocities based on the lattice strain method which gives a bell shape velocity distribution with the fast direction between the c and a axes. We used additional results from nuclear resonant inelastic X-ray scattering to constrain errors and provide additional validation of the accuracy of our results.
Received 14 June 2007; accepted 26 June 2008; published 30 September 2008.
Citation: (2008), Experimental determination of the elasticity of iron at high pressure, J. Geophys. Res., 113, B09213, doi:10.1029/2007JB005229.
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