The heat capacity of polycrystalline germanium disulfide alpha-GeS2 has been measured by relaxation calorimetry, adiabatic calorimetry. DSC and heat flux calorimetry from T = (2 to 1240) K. Values of the molar heat capacity, standard molar entropy and standard molar enthalpy are 66.191 J . K-1 . mol(-1), 87.935 J . K-1 . mol(-1) and 12.642 kJ . mol(-1). The temperature of fusion and its enthalpy change are 1116 K and 23 kJ . mol(-1), respectively. The thermodynamic functions of alpha-GeS2 were calculated over the range (0 <= T/K <= 1250). (C) 2010 Elsevier Ltd. All rights reserved.