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Hugoniot equation of state of periclase to 200 GPa

Vassiliou, M. S. and Ahrens, Thomas J. (1981) Hugoniot equation of state of periclase to 200 GPa. Geophysical Research Letters, 8 (7). pp. 729-732. ISSN 0094-8276. doi:10.1029/GL008i007p00729.

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New shock wave data on {100} oriented single crystal periclase covering the pressure range from 160 to 200 GPa suggest that MgO is described by a single Hugoniot up to 200 GPa, with no displacive phase transitions of volume change greater than 1-1.5 per cent. For a third order finite strain fit, with K_0 constrained to its ultrasonically determined value of 162.7 GPa, the implied K_0′ of 4.27 ± 0.24 is in agreement with ultrasonically determined value of 4.17 ± 0.14. The new data indicate a somewhat steeper Hugoniot than that suggested by previously published shock wave results under 120 GPa. A previously published result at 258 GPa shows more compression in the light of the present data than would be expected for MgO in the B1 structure, and may signal the onset of a phase transition, although we cannot confidently make this interpretation. If MgO forms an ideal solid solution with FeO, our data does not support the occurrence of a significant transition in magnesiowustite at lower mantle pressures.

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Additional Information:Copyright 1981 by the American Geophysical Union. (Received April 21, 1981; accepted May 14, 1981.) Paper number 1L0864.
Issue or Number:7
Record Number:CaltechAUTHORS:20141103-155129976
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Official Citation:Vassiliou, M. S., and T. J. Ahrens (1981), Hugoniot equation of state of periclase to 200 GPa, Geophys. Res. Lett., 8(7), 729–732, doi:10.1029/GL008i007p00729.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51206
Deposited By: George Porter
Deposited On:04 Nov 2014 00:03
Last Modified:10 Nov 2021 19:07

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