Ceramics-Silikáty 23, (4) 289 - 305 (1979)

Equations for the calculation of enthalpy of eutectic and peritectic (incongruent) melting in multicomponent systems were derived on the basis of relations between enthalpy (and heat capacity) and phase (and chemical) composition of heterogeneous systems. In the derivation use was made of supplementary quantities related to the reference state represented by a heterogeneous mixture of molten pure components and to a model of regular melt behaviour. The relationship was further analysed between heat flux and the rate of melting during the heating up of a heterogeneous system; the model of sample with non-uniform temperature distribution has been suggested for the purpose of calculating the "equilibrium" curve of dynamic calorimetry from a known phase diagram.