A newly refined version of the phase diagram PbTe–Bi2Te3 pseudo-binary system was construc-ted using differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. It established that forms three tetradymite-type layered ternary compounds, namely PbBi2Te4, PbBi4Te7, PbBi6Te10, all these phases melt with peritectic decomposition. However, earlier reported Pb3Bi4Te9, Pb2Bi6Te11, PbBi...