RANDOM WALK IN AMORPHOUS MATERIALS
Yves Limoge, J.L. Bocquet · Modern Physics Letters B · 1991
Among the properties of non-crystalline materials one of the least understood is the mass transport. Depending on the measurement which is done the transport appears either as gaussian or dispersive. We show in this paper that the key point for the understanding of diffusion properties lies in a proper introduction of both aspects of disorder, site and saddle, in random models.