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Shock temperatures in CaO

Boslough, Mark B. and Ahrens, Thomas J. and Mitchell, Arthur C. (1984) Shock temperatures in CaO. Journal of Geophysical Research B, 89 (B9). pp. 7845-7851. ISSN 0148-0227. doi:10.1029/JB089iB09p07845.

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Blackbody temperatures of CaO shocked to pressures from 140 to 182 GPa have been measured in the 3750 to 6000 K range using the Lawrence Livermore National Laboratory light gas gun. These shock temperatures, along with Hugoniot data for single crystal and porous CaO and isothermal data, are used to construct equations of state for the high pressure (B2) phase of CaO. The zero-pressure density of the B2 phase is between 3.8 and 4.0 Mg/m^3 and the B1-B2 transition energy is 2.1 to 2.3 MJ/kg. The density and bulk modulus at pressures from 70 to 135 GPa are similar to seismically determined values for the lower mantle of the earth. Thus the lower mantle could have a substantial inventory of Ca-bearing minerals, and mixed oxide models, for the composition of the lower mantle will be insensitive to the quantity of CaO assumed.

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Additional Information:Copyright 1984 by the American Geophysical Union. (Received July 11, 1983; revised February 22, 1984; accepted March 30, 1984.) Paper number 4B0519. We wish to thank D. Bakker, E. Jerbic, and the rest of the technical personnel at the Lawrence Livermore National Laboratory light-gas gun facility and standards laboratory. We appreciate discussions with G. Lyzenga, W. Nellis, and J. Trainor, and the facilities provided at Livermore. M. Abraham provided CaO samples, and G. Rossman and his students at Caltech provided assistance in determining optical properties, for which we are grateful. We also appreciate the help of E. Gelle and others at the Caltech shock-wave laboratory in sample preparation. Support was provided by National Science Foundation grant EAR78 12942 at the California Institute of Technology and by the Lawrence Livermore National Laboratory. This is contribution 3931 from the Division of Geological and Planetary Sciences, California Institute of Technology.
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NSFEAR78 12942
Lawrence Livermore National LaboratoryUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3931
Issue or Number:B9
Record Number:CaltechAUTHORS:20141030-123016605
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Official Citation:Boslough, M. B., T. J. Ahrens, and A. C. Mitchell (1984), Shock temperatures in CaO, J. Geophys. Res., 89(B9), 7845–7851, doi:10.1029/JB089iB09p07845.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51074
Deposited By: George Porter
Deposited On:30 Oct 2014 20:19
Last Modified:10 Nov 2021 19:05

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