The results of Monte Carlo simulations of diffusion in disordered lattices with two-level distributions of site and transition (saddle point) energies were presented. Simulations were conducted for both single- and many-particle cases. In the single-particle case, the simulation result was consistent with previous work. The blocking effect was analyzed through the correlation factor, averaged time between two consecutive jumps and diffusion coefficient. In the many-particle case it was found that τ- and F-effects acted in opposite directions on the diffusivity. In particular, the diffusion exhibited a normal behavior for a transition disordered lattice where the τ-effect was always weaker than the F-effect. For the site and combining disordered lattices the slight coverage dependence of diffusion coefficient and anomalous behavior also occurred depending on the temperature and distribution of site and transition energies.

Study of Blocking Effect for Diffusion in Disordered Lattice. P.K.Hung, N.T.T.Ha, N.V.Hong: Journal of Non-Crystalline Solids, 2012, 358[8], 1141-5