Compressional sound velocity, equation of state, and constitutive response of shock-compressed magnesium oxide

T. S. Duffy, T. J. Ahrens

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108 Scopus citations

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 US = 6.87(10) + 1.24(4)up, where the numbers in parentheses are one standard deviation uncertainties in the last digit(s). Reverse-impact wave profiles constrain the compressional sound velocity, VP, at 10-27 GPa to ±2%. 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. 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. -from Authors

Original languageEnglish (US)
Pages (from-to)529-542
Number of pages14
JournalJournal of Geophysical Research
Volume100
Issue numberB1
DOIs
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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