Abstract
The phase diagrams of two nanoscaled thin films with bond and site dilutions at the surfaces, described by the spin-1 Ising model with single-ion anisotropy (D), are investigated by the use of the effective field theory with correlations. They are consisted of two layers. A number of characteristic phenomena have been found in the behaviors of transition temperature and tricritical point, which are heavily dependent on the ratios (r=J1/J and d=D/J) and a concentration (p) of bond or site dilution at the surfaces, where J is the exchange interaction in inner layer and J1 is the exchange interaction between the surface.
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