Experimental investigation of the 3Tl2Se + Sb2Te3 ↔ 3Tl2Te + Sb2Se3 phase diagram

► The self-consistent phase diagram of the 3Tl2Se + Sb2Te3 ↔ 3Tl2Te + Sb2Se3 system is constructed. ► Solid solutions in the systems Tl9SbSe6-Tl9SbTe6 and TlSbSe2-TlSbTe2 have been studied. ► Partial molar functions of thallium are calculated in revealed nonstoichiometric phases.