Hugoniot equation of state of periclase to 200 GPa
- Creators
- Vassiliou, M. S.
- Ahrens, Thomas J.
Abstract
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.
Additional Information
Copyright 1981 by the American Geophysical Union. (Received April 21, 1981; accepted May 14, 1981.) Paper number 1L0864.Attached Files
Published - grl1673.pdf
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Additional details
- Eprint ID
- 51206
- Resolver ID
- CaltechAUTHORS:20141103-155129976
- Created
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2014-11-04Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field