Low-temperature heat capacity and thermodynamic functions of DyVO.

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 DyVO in the temperature range 0-350 K. We have determined the absolute entropy and Gibbs energy of formation of dysprosium orthovanadate: S(298.15 K) = 148.34 ± 0.11 J/(mol K), Δ G(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 = 14.42 K). We have determined the thermodynamic characteristics of the transformations in the temperature range 0-42.63 K. [ABSTRACT FROM AUTHOR]