Metastable phases in the binary system Ga2S3-MnS: Thermal and structural features

Abstract

In a first part is described the equilibrium phase diagram of the Ga₂S₃ - MnS system. In a second part are described two series of metastable phases : 1) phases so-called of the “first generation”, prepared by quenching the phases of this system which are only stable at high temperature, and are metastable at low temperature. 2) phases so-called of the “second generation” prepared by convenient annealing of the preceding metastable phases. Phases of this second series are metastable for all the temperatures they are observed. They are formed by an exothermic process, and decompose by a second exothermic process. They are superstructures of the wurtzite or of the blende.

Three different non-equilibrium phase diagrams are described, according to the thermal conditions of the metastable phases synthesis.