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Article Dans Une Revue Phys Chem Min Année : 2002

Equation of state, elasticity and shear strength of pyrite under high pressure

A. P. Jephcoat
  • Fonction : Auteur
J. Shu H.-K. Mao
  • Fonction : Auteur
Philippe Gillet
R. J. Hemley
  • Fonction : Auteur

Résumé

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 ‚ between the diffracting plane normal and the maximum stress axis. The uniaxial stress component in the sample, t=†3m†1, varies with pressure as t=m3.11+0.43P between 10 and 30 GPa. The pressure derivatives of the elastic moduli dC11/dP=5.76 (-0.15), dC12/dP=1.41 (-0.11) and dC44/dP=1.92 (-0.06) are obtained from the diffraction data assuming previously reported zero-pressure ultrasonic data (C11=382 GPa, C12=31 GPa, and C44=109 GPa).

Dates et versions

hal-00102107 , version 1 (29-09-2006)

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Citer

Sébastien Merkel, A. P. Jephcoat, J. Shu H.-K. Mao, Philippe Gillet, R. J. Hemley. Equation of state, elasticity and shear strength of pyrite under high pressure. Phys Chem Min, 2002, 29, pp.1-9. ⟨10.1007/s002690100207⟩. ⟨hal-00102107⟩
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