NEW PHASE OF VARIABLE COMPOSITION IN THE Tl9TbTe6-Tl9BiTe6 SYSTEM

Abstract

The phase equilibria in the Tl9TbTe6-Tl9BiTe6 system were investigated by using differential
thermal analysis (DTA), X-ray diffraction (XRD), microhardness measurements and its phase diagram was constructed. It is shown that the system is not quasi-binary due to the peritectic melting of
Tl9TbTe6, but stable below the solidus. In the system found a new quaternary phase of variable
composition Tl9Bi1-xTbxTe6 (0<x<1) with Tl5Te3 structure.
Keywords: thallium-terbium tellurides, thallium-bismuth tellurides, phase equlibria, solid solutions, crystal structure