Phase equilibria in the Tl5Te3–Tl9BiTe6–Tl9TbTe6 system

Abstract

Phase equilibria in the Tl₅Te₃–Tl₉BiTe₆–Tl₉TbTe₆ system have been studied using differential thermal analysis, X-ray diffraction, and microhardness measurements. We have mapped out a number of vertical sections, the 760-K isothermal section of its phase diagram, and projections of its liquidus and solidus surfaces. The composition dependences of lattice parameters and microhardness have been obtained. The system has been shown to contain a continuous series of solid solutions, which crystallize in a tetragonal structure (Tl₅Te₃ type, sp. gr. I4/mcm).