The lattice gas model on tetrahedral sites of a BCC lattice: anisotropic diffusion in the intermediate phase

Monte Carlo simulations were carried out on the lattice gas model of tetrahedral interstitial sites in the BCC lattice. Repulsive first- and second-neighbour interactions were explicitly taken into account whereas further ranging forces were handled via mean field terms. Anisotropic diffusion was observed in the low-temperature ordered and in the intermediate partially ordered phase. This latter phase is a candidate for describing the anomalous properties of alpha -AgI.