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Measurement of elastic velocities of MgO under shock compression to 500 kilobars

Davies, Geoffrey F. and Ahrens, Thomas J. (1973) Measurement of elastic velocities of MgO under shock compression to 500 kilobars. Journal of Geophysical Research, 78 (32). pp. 7596-7601. ISSN 0148-0227. doi:10.1029/JB078i032p07596.

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The velocities of rarefaction waves in shock-compressed MgO have been measured by observing the reduction of the shock front velocity near the sample edges due to the rarefaction waves propagating from the edges. The extent of this ‘edge effect’ is difficult to determine accurately because of its emergent nature. Arrangements sensitive to differences in shock front velocity yielded rarefaction wave velocities close to predicted longitudinal velocities in the high-pressure shock state. Velocities closer to the hydrodynamic sound speed in the shock state were obtained from less sensitive arrangements. These results can be interpreted in terms of a two-stage elastoplastic model of the decompression. The longitudinal velocities measured in shock states up to 528 kb imply second pressure derivatives of the elastic moduli c_(ij)″, given by K_0c_(ij)″ = −1 ± 15, where K is the bulk modulus.

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Additional Information:Copyright 1973 by the American Geophysical Union. (Received January 10, 1973; accepted July 20, 1973.) We appreciate the help of D. Johnson and H. Richardson in performing the experiments. We thank T. Vasilos of the Avco Corporation for providing the polycrystalline samples. This research was supported by National Science Foundation grant GA-21396. Contribution 2275, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91109.
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Caltech Division of Geological and Planetary Sciences2275
Issue or Number:32
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Official Citation:Davies, G. F., and T. J. Ahrens (1973), Measurement of elastic velocities of MgO under shock compression to 500 kilobars, J. Geophys. Res., 78(32), 7596–7601, doi:10.1029/JB078i032p07596.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51397
Deposited By: George Porter
Deposited On:06 Nov 2014 23:40
Last Modified:10 Nov 2021 19:10

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