Numerical investigations of anomalous diffusion effects in glasses

A coarse grained non-Markovian lattice model describing the mixed alkali effect (MAE) is presented. This feedback controlled diffusion model allows the qualitative and partially quantitative determination of the dependence on concentration, composition, temperature and frequency of the MAE. In the present contribution we demonstrate the first two properties by numerical investigations and we give some arguments for correctness of the last two statements.