Compressional sound velocity, equation of state, and constitutive response of shock-compressed magnesium oxide
- Creators
- Duffy, Thomas S.
- Ahrens, Thomas J.
Abstract
Wave profile and equation of state (EOS) data are reported for low-porosity polycrystalline magnesium oxide under shock compression. The Hugoniot equation of state between 14 and 133 GPa is U_S = 6.87(10) + 1.24(4)u_p, where the numbers in parentheses are one standard deviation uncertainties in the last digit(s). Reverse-impact wave profiles constrain the compressional sound velocity, V_p, at 10–27 GPa to ±2%. Measured V_p values are consistent with ultrasonic data extrapolated from 3 GPa. By combining the Hugoniot results with ultrasonic data, the adiabatic bulk modulus and its first and second pressure derivatives at constant entropy are 162.5(2) GPa, 4.09(9), and −0.019(4) GPa^(−1). The shear modulus and its first and second pressure derivatives are 130.8(2) GPa, 2.5(1), −0.026(45) GPa^(−1). Polycrystalline MgO has a compressive yield strength of 1–1.5 GPa at the elastic limit which increases to 2.7(8) GPa along the Hugoniot and is similar at unloading. Wave profiles for MgO at 10–39 GPa are described using a modified elastic-plastic model. There are significant differences in the dynamic response of single-crystal and polycrystalline MgO.
Additional Information
© 1995 The American Geophysical Union. Received April 6, 1994; revised July 28, 1994; Accepted August 11, 1994. Paper number 94JB02065. We thank S. M. Rigden for performing the ultrasonic sound velocity measurements. M. Long, E. Gelle, and A. Devora provided experimental assistance. The comments of R. Jeanloz and two reviewers are appreciated. We also acknowledge L. Barker and O. B. Crump for helpful discussions. This research was supported by the NSF. Division of Geological and Planetary Sciences, California Institute of Technology contribution 5397.Attached Files
Published - jgrb9793.pdf
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Additional details
- Eprint ID
- 50938
- Resolver ID
- CaltechAUTHORS:20141028-122651904
- NSF
- Created
-
2014-10-28Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological and Planetary Science
- Other Numbering System Identifier
- 5397