Thermodynamic properties of selected glasses in the CaO–Al2O3–TiO2 system
Source abstract
Abstract
The thermodynamic properties of a Ca 12Al 14O 33 (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 Ca 12Al 14O 33 and Ca 12Al 14O 33+7 wt% TiO 2 glass samples (16.0±1.8 and 14.5±2.4 kJ/mol, respectively) and the enthalpy of dissolution of TiO 2 (rut) at 1073.15 K were obtained by drop solution calorimetry in a 2PbO–B 2O 3 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 TiO 2 additions on the thermodynamic properties of glasses shows that there is no influence on heat capacity of C12A7 up to 7 wt% of TiO 2. In contrast, a negative deviation of the enthalpy of formation from oxides at 298.15 K from the ideal-mixing straight line was observed.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Glass properties and applications · Luminescence Properties of Advanced Materials · Thermal and Kinetic Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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