Abstract
The high-temperature cell parameters of lime (CaO), periclase (MgO), corundum (Al2O3), and spinel (MgAl2O4) have been determined from 300 up to 3000 K through X-ray diffraction experiments with synchrotron radiation. The good agreement found with dilatometric results suggests that vacancy-type defects do not make a large contribution to thermal expansion for these oxides, even near the melting point, justifying the use of X-ray diffraction for determining volume properties up to very high temperatures. Thermal expansion coefficients were determined from the measured cell volumes with equations of the form α=α0 + α1 T + α2/T 2. Along with available isobaric heat capacity and compressibility data, these derived coefficients clearly show that anharmonic effects contribute little to the isochoric heat capacities (C v ) of CaO, MgO, and Al2O3, which do not depart appreciably from the 3nR Dulong and Petit limit.
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Received: 31 March 1999 / Revised, accepted: 23 June 1999
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Fiquet, G., Richet, P. & Montagnac, G. High-temperature thermal expansion of lime, periclase, corundum and spinel. Phys Chem Min 27, 103–111 (1999). https://doi.org/10.1007/s002690050246
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DOI: https://doi.org/10.1007/s002690050246