Measured elastic moduli of single-crystal MgO up to 1800 K |
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| Authors: | Donald G Isaak Orson L Anderson Takayasu Goto |
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| Institution: | 1. Institute of Geophysics and Planetary Physics, University of California, 90024-1567, Los Angles, CA, USA
2. Dental School, Asahi University, Hozumi-cho, Motosu-gun, 501-02, Gifu, Japan
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| Abstract: | Using the rectangular parallelepiped resonance method we measured the temperature dependence of the adiabatic elastic moduli of single-crystal MgO over the temperature range 300–1800 K. The high temperature limit of our measurements extends by 500 K the upper limit over which elasticity data on MgO are now available. Although our measured temperature dependence of C ij s are generally in good agreement with previous measurements over a more narrow range in temperature, we found that C 44 s decreases more rapidly with temperature, for T > 1000 K, than previous studies suggest. We also found that each of the slopes (?C 11 s /?T)p, (?Ks/?T)p, and (C 44 s /?T)p become less negative with increasing temperature for T > 1400 K. From our measurements on elasticity we are able to confirm that the Grüneisen parameter at zero pressure is nearly constant with temperature up to 1800 K, with only a slight decrease above 1000 K. Utilizing our new data we present calculations showing the temperature dependence of thermodynamic parameters important in studies of earth's interior. |
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