| Abstract: | A model for atom diffusion on surface is proposed, the energy barrier for surface self-diffusion as well as the barrier for diffusion along surface steps being considered. Using a Monte Carlo method, the equilibrium structure of crystal surface is obtained and its effect on the surface self-diffusion is studied. The mass transfer surface self-diffusivity Ds and the mean diffusion distance λ are calculated for different temperatures T. A nonlinear Arrhenius plot (log D vs l/T) is obtained. The maximal deviation from linearity occurs at roughening temperature. |
