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Determination of Molar Gibbs Energies and Entropies of Mixing of Melts in Binary Subsystems of the System CaO • Si02—2CaO • Al203 • Si02—CaO • Al203 • 2Si02. 1. Theoretical Part. 2CaO • Al203 • Si02—CaO • Al203 • 2Si02 System

I. Proks, J. Strečko, L. Kosa, I. Nerád, and K. Adamkovičová

Institute of Inorganic Chemistry, Slovak Academy of Sciences, CS-842 36 Bratislava


Abstract: Method for calculation of component activities in high-temperature binary melt systems is presented. For this purpose, phase diagrams and enthalpies of mixing were used. The latter ones were determined indirectly using primary composition and temperature dependence of relative enthalpy, found by means of multiple linear regression. The method was applied to the melts in the 2CaO . Al2O3 . SiO2-CaO . Al2O3 . 2SiO2 system to find out that within the temperature range 1700 K to 1950 K and limits of experimental errors for enthalpy of mixing these melts behave as athermic solutions. Component activities are equal to equilibrium activities at any composition. The determined activities enabled to calculate the composition and temperature dependences of Gibbs energy and entropy of mixing.

Full paper in Portable Document Format: 471a3.pdf


Chemical Papers 47 (1) 3–7 (1993)

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