chalcogenides

The character of the interaction in the TlAs2Se3Te–TlAs2Te3Se system was studied by the methods of DTA, RFA, MSA, and also by measuring the microhardness and determining the density. State diagram of the system was constructed. It was established that the TlAs2Se3Te–TlAs2Te3Se system is partially a quasibinary section of the quaternary As, Tl//Se, Te system. One congruently melting compound TlAs2Se2Te2 is formed in the system at 548 K.

The As2Se3-Tl3As2S3Se3 system was studied using differential thermal analysis, powder X-ray diffraction, as well as microhardness and density measurements and its phase diagram was constructed. The studied system contains a new quaternary compound ТlAs2Sе3S, which crystallizes in tetragonal structure. The temperature dependence of the electrical conductivity of alloys was studied.