A model for diffusion by isolated vacancies was postulated for stoichiometric CoGa. The model was one in which the sub-lattices exist a priori and the distribution of atoms in each sublattice was random. Four atom-vacancy exchange frequencies and vacancy concentrations up to 6% were specified, as exhibited by stoichiometric CoGa. Monte Carlo computer simulation was used to determine the ratio of the diffusion coefficients. It was shown that the triple-defect mechanism which was postulated to explain the high value of the measured ratio of the diffusion coefficients was actually unnecessary to invoke. The ratio could be explained readily by the present model of diffusion by isolated vacancies.

Diffusion in the Intermetallic Compound CoGa. I.V.Belova, G.E.Murch: Journal of Materials Processing Technology, 2001, 118[1-3], 79-81