The thermodynamic properties of ZrCo intermetallic were investigated both experimentally and theoretically to determine its applicability for the storage of hydrogen isotopes. The enthalpy increments of ZrCo were measured using a high temperature inverse drop calorimeter in the temperature range 642-1497 K. The enthalpy increments and heat capacity obtained for Zr0.5Co0.5(s) in the temperature range 642-1497K were fitted into following polynomial expressions: H-m(0)(T) - H-m(0)(298.15 K)(J.mol(-1)) = 25.682. ((T)/(K)) + 29.807.10(-4).((T)/(K))(2) +2.1864.10(5).((K)/T) - 8655.5 C-p.m(0)(J.K-1.Mol(-1)) = 25.682 + 5.961.10(-3).((T)/(K))- 2.1864.10(5).((K)/(T))(2) The enthalpy of formation of ZrCo(s) at 298.15K was calculated to be -55.96 kJ mol(-1) using the abinitio method. The temperature dependent thermodynamic functions were calculated from the Debye-Gruneisen quasi-harmonic approximation. A set of thermodynamic functions for ZrCo alloy were also calculated using experimental heat capacity data obtained in this study. The theoretically calculated low temperature heat capacity (C-p,m(0)) and entropy (S-m(0)) values of ZrCo smoothly joined with that of experimental high temperature data. (C) 2015 Elsevier B.V. All rights reserved.