The Te-Rich Region of the Bi-Tl-Te System: Bi2Te3-Tl2Te3 and BiTlTe2-Te Sections

Abstract
Detailed studies have been carried out to define the phase relations in the Te‐rich region of the Bi‐Tl‐Te system. Isopleths were constructed for the Bi2Te3‐Tl2Te3 and BiTlTe2‐Te sections, and a schematic diagram is suggested for the projections of the liquidus lines and the invariant planes. The phase behavior can be characterized by the cooling reactions: L+Bi2Te3→BiTlTe2+Te at 325°C, and L→Tl2Te3+BiTlTe2+Te at 223°C. No evidence was found to support the existence of the compound ``BiTlTe3'', as reported by Borisova et al.