Abstract
Physical properties including the equation of state, elasticity, and shear strength of pyrite have been measured by a series of X-ray diffraction in diamondanvil 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 yieilds a quasihydrostatic bulk modulus KOT = 133.5 (±5.2) GPa and bulk modulus first pressure derivative K'OT = 5.73 (±0.58). The apparrent 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 KOT depend largely upon the angle Ψ between the diffracting plane normal and the maximum stress axis. The uniaxial stress component in the sample, t = σ3 - σ1, varies with pressure as t = -3.11 + 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 zeropressure ultrasonic data (C11 = 382 GPa, C12 = 31 GPa, and C44 = 109 GPa).
| Original language | English |
|---|---|
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | Physics and Chemistry of Minerals |
| Volume | 29 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2002 |
| Externally published | Yes |
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Keywords
- Elasticity
- High pressure
- Pyrite
- Radial diffraction
- Shear strength
ASJC Scopus subject areas
- Geochemistry and Petrology
- Materials Science(all)
Cite this
Equation of state, elasticity, and shear strength of pyrite under high pressure. / Merkel, S.; Jephcoat, A. P.; Shu, J.; Mao, H. K.; Gillet, P.; Hemley, R. J.
In: Physics and Chemistry of Minerals, Vol. 29, No. 1, 2002, p. 1-9.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Equation of state, elasticity, and shear strength of pyrite under high pressure
AU - Merkel, S.
AU - Jephcoat, A. P.
AU - Shu, J.
AU - Mao, H. K.
AU - Gillet, P.
AU - Hemley, R. J.
PY - 2002
Y1 - 2002
N2 - Physical properties including the equation of state, elasticity, and shear strength of pyrite have been measured by a series of X-ray diffraction in diamondanvil 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 yieilds a quasihydrostatic bulk modulus KOT = 133.5 (±5.2) GPa and bulk modulus first pressure derivative K'OT = 5.73 (±0.58). The apparrent 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 KOT depend largely upon the angle Ψ between the diffracting plane normal and the maximum stress axis. The uniaxial stress component in the sample, t = σ3 - σ1, varies with pressure as t = -3.11 + 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 zeropressure ultrasonic data (C11 = 382 GPa, C12 = 31 GPa, and C44 = 109 GPa).
AB - Physical properties including the equation of state, elasticity, and shear strength of pyrite have been measured by a series of X-ray diffraction in diamondanvil 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 yieilds a quasihydrostatic bulk modulus KOT = 133.5 (±5.2) GPa and bulk modulus first pressure derivative K'OT = 5.73 (±0.58). The apparrent 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 KOT depend largely upon the angle Ψ between the diffracting plane normal and the maximum stress axis. The uniaxial stress component in the sample, t = σ3 - σ1, varies with pressure as t = -3.11 + 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 zeropressure ultrasonic data (C11 = 382 GPa, C12 = 31 GPa, and C44 = 109 GPa).
KW - Elasticity
KW - High pressure
KW - Pyrite
KW - Radial diffraction
KW - Shear strength
UR - http://www.scopus.com/inward/record.url?scp=0036124125&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036124125&partnerID=8YFLogxK
U2 - 10.1007/s002690100207
DO - 10.1007/s002690100207
M3 - Article
AN - SCOPUS:0036124125
VL - 29
SP - 1
EP - 9
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
SN - 0342-1791
IS - 1
ER -