  The ZrCo intermetallic was proposed as tritium storage material in the
International Thermonuclear Experimental Reactors (ITER) project. 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 645-1500 K.
A set of thermodynamic functions such as entropy, Gibbs energy function, heat
capacity, Gibbs energy and enthalpy values for ZrCo were calculated using the
data obtained in this study. The polynomial expression of enthalpy increments
and heat capacity obtained for ZrCo(s) in the temperature range 642-1497 K are
given as: H(T) - H(298.15 K) (J/mol) = 25.682x(T/K) + 29.804x10e-4 (T/K)**2+
2.1864x10e+5 (K/T) - 8655.5 Cp (J/K/mol) =25.682 + 5.916x10e-3 (T/K) -
2.1864x10e+5 (K/T)**2 The enthalpy of formation of ZrCo at 0 K was calculated
as -55 kJ mol-1 using the ab-initio method. The entropy (S) and specific heat
capacities (Cv and Cp) of ZrCo were also computed using Debye-Gr\"uneisen
quasi-harmonic approximation. A good agreement between the experimental and
theoretically calculated values of specific heat (CP) and entropy was obtained.
