Thermodynamic Properties of (CaO)0.5(Al2O3)0.1(SiO2)0.4 Glass

Thermodynamic properties of (CaO)(0.501)(Al2O3)(0.098)(SiO2)(0.401) (Ca-40.10) glass are studied using two techniques: low-temperature vacuum adiabatic calorimetry and high-temperature drop solution calorimetry. The enthalpy of formation from oxides (-17.6 +/- 2.6 kJ/mol) is determined for the first time. Heat capacity is shown to grow monotonically with temperature in the interval of 8 to 357 K. No phase transitions are revealed in this region of temperatures. Results from measuring heat capacity are approximated using the semi-empirical Planck-Einstein model. The possibility of using incremental scheme to estimate the heat capacity of ternary glasses formed by calcium, aluminium, and silicon oxides is confirmed.