Physics and Chemistry of Minerals, 29, pp. 1-9, (2002) [doi: 10.1007/s002690100207]
Equation of state, elasticity and shear strength of pyrite under high pressure
S. Merkel, A.P. Jephcoat, J. Shu, H.K. Mao, P. Gillet and R.J. Hemley
Physical properties including the equation of state, elasticity, and shear strength of pyrite have been measured by a series of X-ray diffraction in diamond-anvil cells at pressures up to 50 GPa. A Birch-Murnaghan equation of state fit to the quasihydrostatic pressure-volume data obtained from laboratory X-ray source/film techniques yields a quasihydrostatic bulk modulus K0T=133.5 (5.2) GPa and bulk modulus first pressure derivative K'0T=5.73 (0.58). The apparent equation of state is found to be strongly dependent on the stress conditions in the sample. The stress dependency of the high-pressure properties is examined with anisotropic elasticity theory from subsequent measurements of energy-dispersive radial diffraction experiments in the diamond-anvil cell. The calculated values of K0T depend largely upon the angle
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