The development of the Cd_1-x-yMn_yHg_xTe and Zn_1-x-yMn_yHg_xTe solid solutions which has been proposed for infrared photoelectric devices with predetermined spectral characteristics has made significant progress as they are a narrow band gap materials with direct optical transition. To configure high-quality heterostructure films, lattice-matching growth is required. For these purposes it is important to clarify the relatively wide regions of instability and immiscibility, which restricts applications of these materials. In spite of the lattice constants being almost identical for the two limiting (binary) cases of CdHgTe (6.48Å for CdTe and 6.46Å for HgTe), the metallurgical interface is usually enriched with structural defects, in particular, mismatch dislocations, elastic deformations, gettered impurities, etc. This results in the significant changes of thermodynamics stability conditions thin quaternary films. This paper presents calculations of spinodal and binodal isotherms of Cd_1-x-yMn_yHg_xTe and Zn_1-x-yMn_yHg_xTe solid solutions and their pseudomorphic thin films on the basis of the delta-lattice parameter model. We used in this work ternary compound Cd_1-yZn_yTe and Cd_1-yMn_yTe as substrate for growth films. The novelty of the approach consists in the consideration of mismatch dislocations in elastic energy relaxation.

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