The heat capacity measurements of the crystalline phosphate CsCoPO4 with a beta-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 C-p,m(o)/R, Delta H-T(0)m(o)/RT, Delta S-T(0)m(o)/R and Phi(o)(m)/R were calculated over the range of T = (0 and 650) K from experimental values and the fractal dimension D-fr evaluated. Standard entropy of formation at T = 298.15 K was estimated to be (-386.40 +/- 1.38) J . K-1 . mol(-1) for crystalline phosphate CsCoPO4. (C) 2015 Elsevier Ltd. All rights reserved.