Phase equilibria in the MnTе–MnGa2Te4–MnIn2Te4 system

Abstract

A family of compounds with the general formula АВ2Х4 (А – Mn, Fe, Co, Ni; B – Ga, In, Sb, Bi; X – S, Se, Te) and complex phases of variable compositions based on them are among promising functional materials with thermoelectric, photoelectric, optical, and magnetic properties. In this article, we continued the study of multi-component systems basd on the chalcogenides of transition metals and presented the results of the study of phase equilibria in the MnTе–MnGa2Te4–MnIn2Te4 system using differential thermal analysis and X-ray phase analysis. Based on the experimental results, we built the polythermal cross sections MnTe–MnGaInTe4 and MnGa2Te4–[A] (where [A] is a biphasic alloy of the 2MnTe–MnIn2Te4 side system of the 50.0 mol% MnIn2Te4 composition) as well as an isothermal section of a phase diagram at 800 K and a projection of the liquidus surface. It was established that the liquidus consists of the fields of primary crystallisation of 4 phases: 1 – Mn-ht; 2 – phases based on various modifications of MnTe; 3 – g 1; 4 – g2. We also identified types and coordinates of non-variant and monovariant equilibria. Based on triple compounds (MnGa2Te4, MnIn2Te4), we determined wide regions of solid solutions that are of particular interest as magnetic materials

Keywords

• manganese-gallium telluride
• manganese-indium telluride
• phase diagram
• liquidus surface
• solid solutions
• magnetic materials