The constraints for the thermodynamic parameters of the (A,B)m(A,B)n↔(A,B)m+n type order–disorder transformation

A mathematical analysis of the constraints on the thermodynamic parameters of the compound energy formalism for an (A,B)m(A,B)n↔(A,B)m+n type order–disorder transformation is studied. Both the ordered phase and the disordered phase can be described using the two-sublattice model after the formula image, with image for the disordered phase and image for the ordered phase. The constraints between the parameters for the ordered state were derived. The thermodynamic characteristics of the transformation are illustrated using a mathematical method and the validity of the model and the constraints is tested.