Low-temperature heat capacity and thermodynamic functions of DyVO4

The heat capacity of dysprosium orthovanadate has been determined by adiabatic calorimetry in the range 6.12–343.26 K. The present and earlier data have been used to calculate the thermodynamic functions of DyVO₄ in the temperature range 0–350 K. We have determined the absolute entropy and Gibbs energy of formation of dysprosium orthovanadate: S ⁰(298.15 K) = 148.34 ± 0.11 J/(mol K), Δ_f G ⁰(298.15 K) = ?1671.6 ± 2.1 kJ/mol. An anomaly has been detected at temperatures below 42 K, due to the Jahn-Teller phase transformation (T _C = 14.42 K). We have determined the thermodynamic characteristics of the transformations in the temperature range 0–42.63 K.