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Shock wave equations of state using mixed-phase regime data

Watt, J. Peter and Ahrens, Thomas J. (1984) Shock wave equations of state using mixed-phase regime data. Journal of Geophysical Research B, 89 (B9). pp. 7836-7844. ISSN 0148-0227. doi:10.1029/JB089iB09p07836.

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A method is given that uses Hugoniot data in the mixed-phase regime to constrain further equation of state (EOS) parameters of low- and high-pressure phases of materials under-going phase transformations on shock loading. We compute the relative proportion of low- and high-pressure phases present in the mixed-phase region and apply additional tests to the EOS parameters of the separate low- and high-pressure phases by invoking two simple requirements: the fraction of high-pressure phase (1) must increase with increasing shock pressure, and (2) must approach one at the high-pressure end of the mixed-phase regime. We apply our analysis to previously published data for potassium thioferrite, KfeS_2, and pyrrhotite, Fe_(0.9)S. We find that including the mixed-phase regime data in the KfeS_2 analysis requires no change in the published high-pressure EOS parameters. For Fe_(0.9)S we must modify the high-pressure phase EOS parameters to account for both the mixed-phase and high-pressure phase Hugoniot data. Our values of zero-pressure density, bulk modulus and first pressure derivative of the bulk modulus of the high-pressure phase of Fe_(0.9)S are 5.3 Mg/m^3, 106 GPa, and 4.9, respectively.

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Additional Information:© 1984 by the American Geophysical Union. Paper number 4B0741. Received September 13, 1982; revised May 2, 1984; accepted May 15, 1984. We appreciate discussions with M. B. Boslough and J. M. Vizgirda as well as a helpful review from J. M. Brown, Computing support was provided by the Office of Computer Services and the Department of Geology, Rensselaer Polytechnic Institute. Supported by NSF grant EAR 79-26384. Contribution 3733, Division of Geological and Planetary Sciences, California Institute of Technology.
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NSFEAR 79-26384
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Caltech Division of Geological and Planetary Sciences3733
Issue or Number:B9
Record Number:CaltechAUTHORS:20141029-111705334
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Official Citation:Watt, J. P., and T. J. Ahrens (1984), Shock wave equations of state using mixed-phase regime data, J. Geophys. Res., 89(B9), 7836–7844, doi:10.1029/JB089iB09p07836
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51002
Deposited By: Tony Diaz
Deposited On:29 Oct 2014 19:30
Last Modified:10 Nov 2021 19:04

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