Abstract
The thermodynamic properties of a Ca12Al14O33 (C12A7) binary glass and the impact of titania additions (+5 and 7 wt%) were studied for the first time using three different calorimetric techniques: low-temperature adiabatic, high-temperature drop solution and transposed temperature drop calorimetry. The enthalpy of formation from oxides at 298.15 K of the Ca12Al14O33 and Ca12Al14O33+7 wt% TiO2 glass samples (16.0±1.8 and 14.5±2.4 kJ/mol, respectively) and the enthalpy of dissolution of TiO2 (rut) at 1073.15 K were obtained by drop solution calorimetry in a 2PbO–B2O3 solvent. A close value (11.9±2.3 kJ/mol) was obtained for the same C12A7 glass by transposed temperature drop calorimetry. The investigation of the impact of TiO2 additions on the thermodynamic properties of glasses shows that there is no influence on heat capacity of C12A7 up to 7 wt% of TiO2. In contrast, a negative deviation of the enthalpy of formation from oxides at 298.15 K from the ideal-mixing straight line was observed.
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