Thermodynamic Properties of M-EuTaO4

Monoclinic M-type europium orthotantalate was obtained by co-precipitation and annealing at ~1673 K and characterized by X-ray powder diffraction, scanning electron microscopy, and chemical analysis. The temperature dependence of molar heat capacity of M-EuTaO4 was measured by adiabatic calorimetry at 8–350 K; the thermodynamic functions (entropy, enthalpy change, and reduced Gibbs free energy) were calculated. The general form of contribution of the Schottky anomaly to the molar heat capacity was determined.