Critical evaluation and optimization of data on the Bi-Te-Se phase diagram and crystal structure of Bi2Te4-Bi2Se3 alloys

Critical analysis of published experimental data on the diagram of the Bi-Te-Se ternary system state is accomplished. The refined version of the diagram of the Bi2Te3-Bi2Se3 quasi-binary system is plotted. The sub-solidus area of this diagram is plotted for the first time on the basis of experimental data and thermo-dynamical calculations. The stratification cupola in a solid state is outlined and the supposition is made on the Bi2Te2Se compound formation by syntetic reaction. The crystallographic data on the solid solutions of the Bi2Te3-Bi2Se3 cross section and Bi2Te2Se compound are generalized