The heat capacity of magnetoplumbite-type PrZnAl11O19 was measured by relaxation, adiabatic, and differential scanning calorimetry techniques in the temperature range 2–1848 K. The smoothed heat capacity values were used to calculate the temperature-dependent entropy, enthalpy change, and reduced Gibbs free energy. The enthalpy of solution in lead borate melt at 1073 K was measured by drop-solution calorimetry, and the enthalpy of formation from binary oxides and standard enthalpy of formation at 298 K were estimated. To determine the probability of PrZnAl11O19 decomposition to binary oxides, the temperature-dependent Gibbs free energy of the solid-phase reaction in the temperature range 298–1800 K was estimated.
Gagarin et al. (Sat,) studied this question.