By high precision dynamic calorimetry the temperature dependences of heat capacity C-p(0) = f(T) for dimer of C-60, orthorhombic and rhombohedral polymerized phases of fullerene C-60 were determined in the temperature range 300-650 K. Besides, endothermic transformations caused by the depolymerization of the polymerized (dimeric) phases of C-60 were studied and their standard thermodynamic characteristics a temperature interval, enthalpy, entropy and Gibbs function were analyzed. Based on the thermodynamic and oscillation spectroscopy data, it was established that the depolymerization proceeds completely and the products formed are a monomer fcc phase of C-60. From the data of the present work and the heat capacity values measured by us earlier in a low-temperature interval, the thermodynamic functions of the substances, viz. the heat capacity C-p(0) (T), enthalpy H-0 (T) -HO(0), entropy S-0 (T) - S-0 (0) and Gibbs function G(0) (T) - H-0 (0), were calculated over the range from T --> 0 to (380-490) K at standard pressure. The results were discussed taking into account literature data. A sequence of a relative thermodynamic stability at 298.15 K and atmosphere pressure of the crystalline polymerized C-60 phases was arranged. (C) 2004 Elsevier B.V. All rights reserved.