Thermodynamic properties of crystalline phosphate Ba0.5Zr2(PO4)3 over the temperature range from T → 0 to 610 K

The temperature dependence of the heat capacity of crystalline barium zirconium phosphate C p o = f ( T ) was measured over the temperature range 6–612 K. The experimental data obtained were used to calculate the standard thermodynamic functions C p o ( T ), H °( T ) − H °(0), S °( T ), G °( T ) − H °(0) over the temperature range from T → 0 to 610 K and standard entropy of formation at 298.15 K. The data on the low-temperature (6 ≤ T /K ≤ 50) heat capacity were used to determine the fractal dimension of Ba 0.5 Zr 2 (PO 4 ) 3 . Conclusions concerning the topology of the structure of phosphate were drawn. Thermodynamic properties of M 0.5 Zr 2 (PO 4 ) 3 (M = Ca, Sr, Ba) were compared.