期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 113, 期 B9, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2007JB005229
关键词
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资金
- NSF [EAR-0738873, EAR-0337006, 0409321]
- Carnegie DOE Alliance Center (CDAC)
- DOE-BES
- DOE-NNSA
- DOD-TACOM
- W. M. Keck Foundation
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Japan Synchrotron Radiation Research Institute (JASRI)
- IXS experiments [2003A0022-ND3-np, 2003B0693-ND3d-np]
- Directorate For Geosciences
- Division Of Earth Sciences [0738873, 0409321] Funding Source: National Science Foundation
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.
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