Low-Temperature Thermodynamic Properties of Sodium-Cesium Trimolybdate NaCsMo3O10

Abstract

The heat capacity of sodium-cesium trimolybdate NaCsMo₃O₁₀ was measured by the adiabatic method in the range of 5–319 K. No thermal anomalies in the behavior of heat capacity have been found. However, a feature was revealed indicating the presence of a low-frequency peak in the density of phonon states. The Debye temperature at absolute zero was determined by extrapolating the experimental data to absolute zero. Based on the smoothed heat capacity values, the isobaric thermodynamic functions (entropy, enthalpy increment, reduced Gibbs energy) were calculated in the range of 0–320 K.