Abstract
With a Monte Carlo method we have investigated tracer and conductivity (physical) correlation factors in the simple cubic lattice gas with two f.c.c. inequivalent sublattices and self exclusion by the atoms. Except at very low temperatures, excellent agreement was found between our results for the conductivity correlation factor and Richard's approximate treatment. At an occupation of 0.5 the Haven Ratio exhibits the characteristic discontinuity found recently in other lattice gases which give ordered arrangements. On the concentration axis at low temperature we found another discontinuity in the Haven Ratio. All of these discontinuities are associated with changes in mechanism.
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