Ceramics-Silikáty 42 (2) 55-59 (1998)

 THE HEAT CAPACITIES OF LIQUIDS IN THE SYSTEM CaSiO₃ -Ca₂Al₂SiO₇ -CaAl₂Si₂O₈

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

The composition dependencies of molar heat capacity, molar heat capacity of mixing, partial molar heat capacity for constituents and partial molar heat capacity of mixing for constituents of liquids in the CaSiO₃ - Ca₂Al₂SiO₇ - CaAl₂Si₂O₈ system were determined from experimental relative enthalpy data. The heat capacity values related to one atom of a formula molecule in these liquids exceeds the 3R-value by about 5 to 16 J/mol K. The largest changes in the number and/or kind of degrees of freedom of particles in the melt arise when the liquid of Ca₂Al₂SiO₇ or CaAl₂Si₂O₈ is added to large amount of CaSiO₃ liquid and when the liquid of CaSiO₃ or supercooled liquid of Al₂O₃ is added to large amounts of Ca₂Al₂SiO₇ or CaAl₂Si₂O₈ liquids.

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