  . This study is devoted in the search of a model describing the best possible
liquid and solid phases of the systems Cd-Te, Hg-Te, and Cd-Hg-Te. For the
liquid phases, we used the model of Sub-regular Associated Solution (S.A.S).
Thermodynamic quantities of dissociation, for the associated species are
calculated by the numerical resolution of the phase equilibrium equations. The
results of this calculation indicate a more marked associated character in
Cd-Te than in Hg-Te with a pseudo-regular behavior of the binary liquid Cd-Te.
The phases diagrams calculated from thermodynamic quantities, describe very
well the experimental diagrams especially for the binary systems. This models
used to calculate the parameters of interactions, enthalpy and entropy of
dissociation and mixture, this thermodynamic quantities not measurable used to
describe phases diagrams and other studies.
