Self-Diffusion in a Square Lattice Gas with Extended Hard Core

摘要

Lattice gas model with extended hard core is used to study tracer diffusion in a square planar lattice. For the vacancy availability factor a simple approximation, which decouple higher order correlations in terms of the pair correlation function, is suggested. The results for the third, fourth order correlation functions and the vacancy availability factor are compared with the recent Monte Carlo data of Froboese and Jaeckle. The tracer correlation factor is in qualitative agreement with that of Murch. 27 references, 5 figures. (ERA citation 12:029733)