Heat capacity and thermodynamic functions of CaMoO4 at low temperatures
Abstract The heat capacity of a single crystal of calcium molybdate CaMoO4 was measured by the adiabatic method in the range 6 310 K. No anomalies in the heat capacity associated with the phase transition were found. Based on the obtained data, thermodynamic functions (entropy, enthalpy, and Gibbs free energy) were calculated. Special features of the heat capacity behavior near zero temperatures as well as special features of the phonon density of states at low frequencies were detected. The low frequency peak in the phonon density of states of CaMoO4 was identified, which is associated with the phonon scattering on the regular fragments of the structure. The Debye temperature at absolute zero was calculated.