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Measurement of elastic properties of single-crystal CaO up to 1200 K

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Abstract

The elastic moduli of a single-crystal calcium oxide, CaO, are measured in the temperature range from 300 to 1200 K (1.8 times of the Debye temperature) by the resonant sphere technique (RST). The lowest 18 modes are identified in the frequency range from 0.6 to 1.4 MHz for the vibrating spherical specimen, which is 5.6564 mm in diameter and 3.3493 g/cm3 in density at room temperature, and the resonant frequencies are traced as a function of temperature. The adiabatic elastic moduli are determined in the present temperature range from the observed frequencies by inversion calculations. Most of the elastic moduli, except forC 12 modulus, decrease as temperature increases. The temperature curves ofC s andC 44 moduli cross at 372 K. This means that the CaO specimen has an isotropic elasticity at the temperature. The temperature derivatives (∂C 11/∂T) P and (∂C s/∂T) P become slightly less negative with temperature increase and (∂C s /∂T) P and (∂C 44/∂T) P are almost constant. Combining the present elastic data with thermal expansion and specimen heat capacity data of CaO, we present the temperature dependence of thermodynamic parameters important in the studies of earth's interior.

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Oda, H., Anderson, O.L., Isaak, D.G. et al. Measurement of elastic properties of single-crystal CaO up to 1200 K. Phys Chem Minerals 19, 96–105 (1992). https://doi.org/10.1007/BF00198607

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