Study of the Structure of Composite Materials Based on PbSb2Te4 Obtained by the Czochralski Method

Research on PbSb2Te4 composite material samples, obtained by the Czochralski method, is continued. The multiphase structure of the material is confirmed. Based on the analysis of X-ray studies, the predominance of PbSb2Te4 (70–80%) and Sb2Te3 (20–30%) phases is found. Traces of (CuSb)Te2 phases with a rhombohedral structure and a hexagonal phase of Sb2Te2 are detected. The carrier concentration is reduced by doping the samples with copper; the impurity atoms are located in the Van der Waals gap between the layers of the main phases. With the copper content in the initial charge increasing from 0.5 to 1 at %, the carrier concentration does not decrease further.