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

Abstract

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.