Cooperative mechanism of diffusion in metal glass

General relations for diffusion coefficients for the cooperative mechanism of diffusion are obtained on the basis of the proposed model of metal–metalloid glass. The thermodynamics of Bernal–Polk complexes is developed by using the Ising–Nakano Hamiltonian and the theory of frozen-in fluctuations. The temperature dependence of diffusivity is analyzed in the cases of large and small variance of pair interatomic correlations.