PHASE EQULIBRIA IN Mn-Bi2Se3 SYSTEM
Phase equilibria of polythermal cross-section Mn-Bi2Se3 were studied through the use of physical and chemical analysis methods (differential-thermal, X-ray phase, metallographic). Phase state diagram of the section Mn-Bi2Se3 of triple system Mn-Bi-Se was constructed. It revealed that the section is non-quasibinary and crosses fields of two subordinate systems. Mn-MnSe-Bi, MnSe-Bi-Bi2Se3.Alloys MnBi, MnSe, Mn were jointly crystallized at 2000С in the concentration range of 0 - 57.6 mol% Bi2Se3 on state diagrams. The second part of the state diagram of Mn-Bi2Se3 (concentration range of 57.6 - 100 mol% Bi2Se3) is more complex. Triple peritectic compounds of Mn3Bi2Se6, MnBi2Se4, as well as binary compounds BiSe and Bi2Se3 were reflected in this part of the state diagram. Alloys MnBi2Se4, BiSe, MnSe were crystallized in the triple non-variant eutectic point at 2400С. Solid solutions based on initial components were practically absent.