By methods of differential thermal, X-ray phase analysis and also by measurement of microhardness and emf of concentration circuits concerning a thallic electrode the systems Tl₉BiTe₆–Tl₅Te₂Cl (Br, J) were investigated. T–x diagrams, also graphs of concentration dependences of microhardness, parameters of a crystal lattice and emf have been constructed. It is established, that all three systems, despite of presence of wide areas of stratifying, are characterized by formation of continuous orders of solid solutions with structure Tl₅Te₃ (tetragonal syngoniya, Sp.gr. I4/mcm).