Phase equilibria and some properties of solid solutions in the Tl5Te3-Tl9BiTe6-Tl5Te2Cl system

Phase equilibria in the Tl₅Te₃-Tl₉BiTe6-Tl₅Te₂Cl system were studied by differential thermal analysis (DTA), X-ray powder diffraction, and measurements of microhardness and also emf of concentration circuits with reference to a thallium electrode. A number of polythermal sections, the isothermal sections of the phase diagram at 760 and 800 K, and projections of the liquidus and solidus surfaces were constructed. It was shown that the system is characterized by the formation of unlimited solid solutions with the Tl₅Te₃ structure. The concentration dependences of the crystal lattice parameters, microhardness, and emf in the solid solutions were described.