A proposed equation of state of stishovite
Abstract
The available shock-wave data for solid α quartz in the stishovite pressure regime are reduced to a 25°C isotherm and an adiabat, centered at standard conditions, using recent standard density, enthalpy, and coefficient of thermal expansion data. The calculated isothermal bulk modulus, 3 Mb, as determined from the Birch-Murnaghan equation, depends critically on the value of (dK/dP)T at zero pressure and to a yet unknown extent on the form of the equation of state. The high-temperature value of Grüneisen's ratio (0.8 to 0.9) along the a quartz (stishovite regime) Hugoniot was obtained from the pressure offsets of the fused quartz and porous quartz Hugoniot. The high value for γ obtained from thermochemical data at standard conditions (1.5±0.3) suggests that a marked decrease in the value of γ to 0.8 occurs with increasing temperature.
Additional Information
Copyright 1970 by the American Geophysical Union. (Received May 19, 1969; revised October 3, 1969.) We thank W. A. Bassett, W. Isbell, A. Jones, L. G. Liu, M. It. Manghnani, H. Shipman, L. Thomsen, and J. S. Weaver for allowing us to quote their data, and D. Chung and G. Simmons for a preprint of their paper. We are also grateful to J. S. Weaver for pointing out some mistakes in our manuscript, and to O. L. Anderson for suggestions for improving the manuscript. This research was supported at C.I.T. under contract DASA 0168-C-0069 and at Rochester by NSF grant GA-1430. Contribution 1619, Division of Geological Sciences, California Institute of Technology, Pasadena, California 91109.Attached Files
Published - jgr11991.pdf
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Additional details
- Eprint ID
- 51430
- Resolver ID
- CaltechAUTHORS:20141107-104321219
- DASA 0168-C-0069
- Defense Atomic Support Agency (DASA)
- GA-1430
- NSF
- Created
-
2014-11-07Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological Sciences
- Other Numbering System Identifier
- 1619