ROENTGENOGRAPHIC INVESTIGATION OF SOLID-PHASE EQUILIBRIA IN THE TlSbТe2–TlТbTe2 SYSTEM

The solid-phase equilibria in the TlSbТe2–TlТbTe2 system been forts studied by using the powder X-ray diffraction method. It was established that despite the isostructural character of the starting compounds (hexagonal structure, Sp. Gr. R-3m), the system is characterized by a limited mutual solubility of the components. The solubility based on TlSbTe2 reaches 30 mol%, and base on TlТbTe2 is about 10 mol%. The lattice parameters of solid solutions are calculated based on powder roentgenograms