We investigate the effect of quenched impurities on phase transition of layer particles. The study is done by means of Monte-Carlo technique on a fixed square lattice in the framework of the lattice gas model. The considered interactions are restricted to first neighboring particles and are of repulsive nature between diffusing particles. Attractive interactions between mobiles particles and impurities are considered. We focus on the behavior of the tracer diffusion coefficient, D*, and the mean square fluctuation of adsorbates particles number /. Our results show that the parameter controlling of phase transition are strongly influenced by the presence of the quenched impurities.We investigate the effect of quenched impurities on phase transition of layer particles. The study is done by means of Monte-Carlo technique on a fixed square lattice in the framework of the lattice gas model. The considered interactions are restricted to first neighboring particles and are of repulsive nature between diffusing particles. Attractive interactions between mobiles particles and impurities are considered. We focus on the behavior of the tracer diffusion coefficient, D*, and the mean square fluctuation of adsorbates particles number /. Our results show that the parameter controlling of phase transition are strongly influenced by the presence of the quenched impurities
