Ceramics-Silikáty 24, (3) 193 - 201 (1980)

By combining calorimetric measurements of the heats of solution ΔH_sol and of enthalpy of cooling ΔH_cool the temperature dependence of relative enthalpy of pseudowollastonite and that of CaSiO₃ melt was determined in the temperature intervals of 1506-1780 K and 1829-1961 K. The following values were determined on the basis of these relationships: heat of fusion of CaSiO₃ at 1817 K ΔH_fus,CS,φ' = 57.3 ± 2.9 [kJ mole^-1], entropy of fusion of CaSiO₃ ΔS_fus,CS,φ' = 31.5 ± 1.6 [J mole^-1 K^-1], temperature dependence of the molar heat of pseudowollastonite C_CS,c,φ = 6.358 X 10^-2 + 5.724 X 10^-5 T [kJ mole^-1 K^-1] and molar heat of CaSiO₃ melt C_CS,m,φ = 1.4985 X 10^-1 [kJ mole^-1 K^-1] in the temperature intervals mentioned above.