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A proposed equation of state of stishovite

Ahrens, Thomas J. and Takahashi, Taro and Davies, Geoffrey F. (1970) A proposed equation of state of stishovite. Journal of Geophysical Research, 75 (2). pp. 310-316. ISSN 0148-0227.

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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.

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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.
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Defense Atomic Support Agency (DASA)DASA 0168-C-0069
Subject Keywords:Mineral Data: Stishovite; Mineralogy: Equations Of State
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Caltech Division of Geological Sciences1619
Issue or Number:2
Record Number:CaltechAUTHORS:20141107-104321219
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Official Citation:Ahrens, T. J., T. Takahashi, and G. F. Davies (1970), A proposed equation of state of stishovite, J. Geophys. Res., 75(2), 310–316, doi:10.1029/JB075i002p00310.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51430
Deposited By: George Porter
Deposited On:07 Nov 2014 19:17
Last Modified:03 Oct 2019 07:32

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