Phase relations in the Tl2S–Tl5Se2Br–TlBr ternary system

The quasiternary Tl2S-Tl5Se2Br-TlBr system is of interest because of the presence of binary and ternary compounds which reveal semiconductor properties and have a wide practical application. The Tl2S-Tl5Se2Br-TlBr phase diagram was investigated by DTA and X-ray methods. Three vertical sections, a liquidus projection and a perspective representation of the phase diagram were constructed. The liquidus of this system consists of four fields of primary crystallization. The one-, two- and three-phase spaces which form the Tl2S-Tl5Se2Br-TlBr ternary system are described.