Thermodynamic properties of liquid phase in the CaO center dot SiO2-CaO center dot Al2O3 center dot 2SiO(2)-2CaO center dot Al2O3 center dot SiO2 system

Thermodynamic properties consistent with phase equilibria and calorimetric measurements were established for liquid phase in the system CaO . SiO2-CaO . Al2O3. 2SiO(2)-2CaO . Al2O3. SiO2 using molecular regular solution model s. The assessed thermodynamic data set involves enthalpy and entropy of for mation of crystalline phases, heat capacity (C-p) data of solid and liquid pure components, enthalpy of mixing of liquid pure components, enthalpy and entropy of fusion of solid phases and phase equilibria experiments. Consid erable inconsistency was found between experimental phase equilibria and ca lorimetrically measured enthalpy of the liquid solution. To fix thermodynam ic properties of melt in studied system, which reproduce phase diagrams sat isfactorily, considerable changes in enthalpy of mixing with respect to the original calorimetric data must be accepted. (C) 2000 Elsevier Science Ltd . All rights reserved.