Correlation characteristics of thermal expansion volume coefficient and thermal capacity in corundum

A detailed consideration of the correlation relationship between the temperature coefficient of volumetric expansion (TCDC) o (T) ?-Al ₂ O ₃ of corundum and its heat capacity C (T) is carried out. It is shown that a clear correlation o (C) takes place not only in the low-temperature region (up to ~ 50 K), where it is linear (Gruneisen's law), but also in a wider temperature range, up to the melting point of corundum. A significant deviation from the low-temperature linear behavior of the temperature dependence TKOR o (C) occurs when the heat capacity reaches the classical 5 * 3R Dulong and Petit limit. The results of the work can be used to verify the data of primary calorimetric and dilatometric studies of ceramic and other materials.