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

• Published in: Journal of thermal analysis and calorimetry 2010-12, Vol.102 (3), p.1147-1154
• Main Authors: Pet’kov, V. I., Shchelokov, I. A., Markin, A. V., Smirnova, N. N., Sukhanov, M. V.
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Calorimetry; Chemistry; Chemistry and Materials Science; Crystal structure; Fractal analysis; Heat capacity; Inorganic Chemistry; Measurement Science and Instrumentation; Phosphates; Physical Chemistry; Polymer Sciences; Specific heat; Thermodynamic properties
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-010-0909-3

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.