Heat Capacity of Na₂W₂O₇ in the Range 1.9–220 K

The results of a study of a sodium ditungstate single crystal based on the experimental heat capacity data are presented. The heat capacity of Na₂W₂O₇ was measured by relaxation calorimetry in the range 1.9‒220 K. No anomalies in the heat capacity associated with phase transitions were detected. The heat capacity was extrapolated to 0 K, and the Debye temperature at 0 K was determined. The thermodynamic functions (entropy, enthalpy increment, and reduced Gibbs energy) were calculated from the experimental heat capacity.