Abstract
A detailed analysis of the tendencies toward ordering and phase separation and more generally the stability properties at T ≠ 0 K in substitutional alloys is carried out using the presciption proposed by Connolly and Williams and the Generalized Perturbation Method. This enables a discussion of the viability and the basic assumptions of both approaches. The effective cluster interactions which enter such a study are derived from a simple but realistic tight binding model.
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