Thermodynamic properties of caesium–magnesium monophosphate

The heat capacity measurements of the crystalline phosphate CsMgPO4 of a tridymite structure were performed between T = (7 and 650) K. The thermodynamic functions Cp,m∘/R, Δ0THm∘/RT, Δ0TSm∘/R, and Φm∘/R were calculated and the fractal dimension Dfr evaluated. From the solution reaction calorimetry, the standard enthalpy of CsMgPO4 formation at T = 298.15 K was found. Thermochemical parameters of formation ΔfGm∘ and lgKf,m∘ were determined by combining the data obtained by these techniques.