Akademik Məlumat İdarəetmə Sistemi
Russian Journal of Inorganic Chemistry, vol.64, no.7, pp.907-913, 2019 (SCI-Expanded, Scopus)
Abstract: Phase equilibria in the quaternary system Tl–Bi–Er–Te in the composition region Tl2Te–Tl9BiTe6–Tl9ErTe6 were studied by physicochemical analysis methods. The phase diagram of the boundary system Tl2Te–Tl9BiTe6 was refined. It was shown that this system is a quasi-binary system of the peritectic type and is characterized by the formation of limited solid solutions based on the initial compounds. A number of diagrams were constructed for the first time, namely, some polythermal sections; the isothermal sections of the phase diagram at 300, 760, and 780 K; and the projections of the liquidus and solidus surfaces of the system Tl2Te–Tl9BiTe6–Tl9ErTe6. It was demonstrated that, in this system, there is a wide region of solid solutions with the Tl5Te3 structure (δ-phase), which occupies more than 90% of the area of the concentration triangle. The homogeneity range of Tl2Te is 5–7 mol %. The obtained results can be used for choosing the compositions of solution melts and the temperature conditions for growing crystals of the δ-phase of a given composition, which are of practical interest as promising thermoelectric and magnetic materials.