Abstract
The temperature dependence of the heat capacity Cpo = 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 Cpo(T), Ho(T) − Ho(0), So(T), and Go(T) − Ho(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 ≤ T ≤ 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.
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