Abstract
A method of statistical description of chemical and magnetic ordering in multicomponent nonstoichiometric solid solutions in arbitrary temperature range has been worked out. The system Hamiltonian adopted for this purpose has a form of perturbation series by multiparticle and multispin interaction potentials. The character of magnetic interactions has been assumed according to the Ising model. The method takes into account multiparticle and multispin correlations as well as the mutual dependence of atomic and magnetic ordering. The free energy has been expressed overtly by the probability of occurence of appropriate chemical and magnetic clusters in the solution.
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