Abstract:
For a lattice model a new method of description is proposed. It is based
on the use of the particle number density and the vacancy number density
simultaneously and makes it possible to use the well-known diagram
technique of the theory of a classical liquid for two-phase states. In the low-temperature region an expansion for the surface tension with
respect to a small parameter is obtained. The critical temperature and
critical exponent of the surface tension are determined by the standard
methods from the coefficients of the low-temperature expansion. The problem of an adsorption layer is considered.
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