The aim of the present study was to determine the phase relations in the Tl₄PbTe₃-Tl₉TbTe₆-Tl₉BiTe₆ section of the Tl-Pb-Bi-Tb-Te system. Based on a set of the methods of the physicochemical analysis (differential thermal analysis, powder X-ray diffraction method as well as microhardness measurements), the phase diagram of the Tl₄PbTe₃-Tl₉TbTe₆ boundary system, some isopleth sections, liquidus and solidus surfaces projections, as well as isothermal sections at 840 and 860 K, were plotted. Unlimited solid solutions with the Tl₅Te₃ structure (δ-phase) were found in the system, which are of interest as a thermoelectric materials.

"Experimental Study of the Tl₄PbTe₃-Tl₉TbTe₆-Tl₉BiTe₆ Section of the Tl-Pb-Bi-Tb-Te System" Samira Zakir Imamaliyeva, Ganira Ilgar Alakbarzade, Vagif Akber Gasymov, Mahammad Baba Babanly. Materials Research. 2018; 21(4): e20180189.