Abstract
Evaluation methods for the estimation of standard enthalpy and entropy of formation, the temperature dependence of heat capacity and the temperature and heat of melting are shown for a generalised description of oxides. The calculation is applied to an actual simulation of the thermochemical data of real and hypothetical compounds for the following Y:Ba:Cu ratios: 123, 112, 213, 235, 133, 223, 135, 247, 124, 125, 516, 145, 146, 415, 132, 153, 312, 385, 163, 232, 143, 212, 122, 211, 121, 152, 131, 221, 321 and 142.