Abstract
Temperature dependences of the heat capacity and the enthalpy change of LaNbO4 were measured using various calorimetric methods (adiabatic, differential scanning and drop calorimetry). It was confirmed that heat capacity has a step-like form in the region of the phase transition, and the second order phase transition “fergusonite-scheelite” proceeds without a thermal effect. Based on the smoothed values of heat capacity, thermodynamic functions (entropy, enthalpy change and Gibbs energy) were calculated over the temperature range from (2–1600) K.
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