The heat capacity and thermodynamic functions of Ca0.5Zr2(PO4)3 crystalline phosphate from T → 0 to 650 K

The temperature dependence of the heat capacity C (p) (o) = f(T) of crystalline calcium-zirconium phosphate was studied over the temperature range 7-650 K by precision adiabatic vacuum and dynamic scanning calorimetry. The experimental data were used to calculate the standard thermodynamic functions C (p) (o) (T), H (o)(T) - H (o)(0), S (o)(T), and G (o)(T) - H (o)(0) at temperatures from T -> 0 to 650 K and the standard entropy of formation of Ca0.5Zr2(PO4)(3) at T = 298.15 K. The data on low-temperature (30 K a parts per thousand currency sign T a parts per thousand currency sign 50 K) heat capacity were used to calculate fractal dimension D. Conclusions about the character of the topology of the structure of the phosphate were drawn.