GeTe–Bi₂Te₃–Te System

Abstract

Alloys of the GeTe–Bi2Te3–Te system, synthesized using a special technique that makes it possible to obtain them in a state as close as possible to equilibrium, have been studied using the methods of differential thermal and X-Ray diffraction analysis, as well as scanning electron microscopy. A solid-phase equilibria diagram, a projection of the liquidus surface, some polythermal sections and an isothermal section at 300 K of the phase diagram were constructed. The fields of primary crystallization of phases, types and coordinates of non— and monovariant equilibria are determined. It has been established that monovariant equilibria on curves emanating from the peritectic and eutectic points of the GeTe–Bi2Te3 boundary system undergo transformations at certain transition points. Near the tellurium corner of the concentration triangle, a cascade of invariant transition reactions has been identified, characterizing the joint crystallization of two-phase mixtures of telluride phases and elemental tellurium.