The Standard Gibbs Energy of Formation of Ni3 ± x S 2

The standard Gibbs energy of formation of has been determined in the temperature range ∼973–1173 K using galvanic cells of the configuration. In the temperature range of the investigation, the open‐circuit EMF of the cell, at any given temperature, was found to be independent of the starting composition of within the experimental error limits. With the composition of in equilibrium with and (1 atm) being , the results in calories per gram mole are The temperature and enthalpy of fusion of are, therefore, 1089 K and 13,635 cal/mol, respectively. For the stoichiometric , we obtained The enthalpy of fusion of is 14,320 cal/mol.