Application of the polyassociative solutions model to determine phase equilibrium in multicomponent A2B6 semiconductor systems and ternery magnetic oxide systems

Resonance of mixing energy and energy of elastic deformations during spinodal decomposition and the composition modulation effect in ZnхCd1-ХTe solid solutions

“…As a rule, the indicated parameter and its temperature dependence are found by processing the data on phase equilibria in the systems in accordance with the model of simple solutions in different approximations. Despite the limited experimental information on the state diagrams of Zn-Cd-Te systems, especially at the low-temperature interval, the solid-state interaction parameters reported in the literature do not contradict their physical meaning and correlate well with each other for A 2 B 6 systems [4,12]. Such a situation justifies the possibility of using the data from works [4,12] for modeling the process of spinodal decomposition of the solid solutions to be considered.…”

“…Despite the limited experimental information on the state diagrams of Zn-Cd-Te systems, especially at the low-temperature interval, the solid-state interaction parameters reported in the literature do not contradict their physical meaning and correlate well with each other for A 2 B 6 systems [4,12]. Such a situation justifies the possibility of using the data from works [4,12] for modeling the process of spinodal decomposition of the solid solutions to be considered. The above considerations allow us to take the following value of the parameter in the calculations ( )…”

“…At the same time, low synthesis temperatures mean that the thermodynamic state of the ZnхCd1-хTe solid solution is close to the state of its spinodal decomposition. This statement follows from experimental and theoretical studies of the low-temperature part of the Zn-Cd-Te system phase diagram [3][4], where it is shown that the critical temperature of the spinodal decomposition of the solid phase is at the level of 300°С. It points out that under typical conditions of a technological process, the synthesis of layers of this system, for example, by vacuum technologies [1,2], is performed at lower temperatures on the substrate.…”

“…It is in this interval of initial values for the initial equation that all the previously discussed conditions for the manifestation of the composition modulation effect in the solid solution, with the complex nature of oscillations, are realized. Indeed, an analysis of the position of the C2 point at 450 K on the temperature -composition thermodynamic phase diagram [3][4] shows that the system is in close proximity to the spinodal of decay and falls into the region of the metastable state, which lies between the spinodal lines and the corresponding binodal. When the initial concentration is located slightly to the left of point C2, the solution of the boundary problem shows a sharp increase in the amplitude of oscillations in the distribution of the composition over the layer thickness.…”

“…А 2 В 6 semiconductor solid solutions are of practical interest for modern electromagnetic radiation recorders on a wide range of wavelengths. Modern technological methods for synthesizing superthin (nano) layers of this class of materials are usually carried out at sufficiently low temperatures [1][2][3][4]. It is the use of low temperatures that determines the possibility of obtaining thin layers of high chemical purity with high crystal structural perfection.…”