Abstract
The heat capacity measurements of the crystalline phosphate CsCoPO4 with a β-tridymite structure were performed between T=(6 and 650)K. Phase transitions were found at T=(313.40, 486.9 and 514.4)K. They correspond to the polymorphic transformations between two monoclinic and two orthorhombic modifications of CsCoPO4, respectively. Thermodynamic functions Cp,mo/R, Δ0THmo/RT, Δ0TSmo/R and Φmo/R were calculated over the range of T=(0 and 650)K from experimental values and the fractal dimension Dfr evaluated. Standard entropy of formation at T=298.15K was estimated to be (−386.40±1.38)J·K−1·mol−1 for crystalline phosphate CsCoPO4.
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