ON THE THEORY OF OPEN SYSTEMS - STATISTICAL THERMODYNAMICS AND DECOMPOSITION TYPE PHASE-TRANSITIONS FOR THE MODEL OF AN ALLOY UNDER IRRADIATION

We discuss a generalization of statistical thermodynamics to the open system case using as an example the model of an alloy under irradiatio n. The statistical properties of the stationary states are described w ith the use of generalized thermodynamic potentials and ''quasi-intera ctions'' determined from the master equation for probabilities. Method s for solution of this equation are illustrated by mean-field type cal culations of correlators, thermodynamic potentials and phase diagrams for disordered alloys.