Low-temperature heat capacity and thermodynamic properties of InSe

The heat capacity of InSe has been measured at temperatures from 11.14 to 325.26 K using an adiabatic calorimeter. The results differ significantly from earlier data (by similar to 2.2% at 200 K). The smoothed heat capacity data have been used to evaluate temperature-dependent thermodynamic functions (entropy, enthalpy increment, and reduced Gibbs energy) of indium selenide. Its thermodynamic properties under standard conditions are C-p(0) (298.15 K) = 49.43 +/- 0.10 J/(K mol), S-0(298.15 K) = 82.20 +/- 0.16 J/(K mol), H-0(298.15 K) - H-0(0) = 10.94 +/- 0.02 kJ/mol, and Phi(0)(298.15 K) = 45.50 +/- 0.09 J/(K mol). The Debye characteristic temperature of InSe evaluated from the heat capacity data is 275 +/- 15 K.