Estimation of Single-Crystal Elastic Moduli from Polycrystalline X-Ray Diffraction at High Pressure: Application to FeO and Iron
- Materials Science Division, National Aerospace Laboratories, Bangalore 5600 17 (India)
- Geophysical Laboratory and Center for High-Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road N.W., Washington, D.C. 20005-1305 (United States)
X-ray diffraction data obtained under nonhydrostatic compression of a polycrystalline sample yield an estimate of the single-crystal elasticity tensor of the material when analyzed using appropriate equations. The analysis requires as input the aggregate shear modulus from independent measurements. The high-pressure elastic moduli of face-centered-cubic FeO, body-centered-cubic iron ({alpha} -Fe), and the pressure-induced hexagonal close-packed iron ({epsilon} -Fe) are obtained. This analysis currently provides the only method of determining single-crystal elasticity tensors in the megabar pressure range and of studying elasticity of very high-pressure phases. {copyright} {ital 1998} {ital The American Physical Society}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 570313
- Journal Information:
- Physical Review Letters, Vol. 80, Issue 10; Other Information: PBD: Mar 1998
- Country of Publication:
- United States
- Language:
- English
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