摘要
Low temperature heat capacity of erbium phosphate ErPO4 was measured by relaxation calorimetry (2-35 K) and adiabatic calorimetry (5-345 K). High-temperature enthalpies of this substance were studied by drop calorimetry in the region of 357-1575 K. Smoothed thermodynamic properties (heat capacity, entropy, enthalpy change and derived Gibbs energy) were calculated in the range of 0-1600 K. Gibbs energy of formation of ErPO4 was estimated using the standard entropy S0(298.15 K) from this work: 螖fG0(ErPO4, 298.15 K) = 鈭?855.3 卤 2.1 kJ mol鈭?. The Schottky heat capacity anomaly was observed in the range from 2 to 300 K.