Preparation and some physical properties of tetradymite-type Sb2Te3 singlecrystals doped with CdS

Single crystals of Sb2Te3 doped with CdS were prepared by a modified Bridgm an method from the elements Sb and Te of 5 N purity and the CdS compound of 4.5 N purity. Samples were characterized by X-ray diffraction and by measu rement of reflectance in the plasma resonance frequency region at room temp erature. Furthermore, we made measurements of temperature dependence of the electrical resistivity, Hall and Seebeck coefficients, and thermal conduct ivity in the temperature range of 4.2-300K. In the process of crystal;growt h, CdS dissociated and it was assumed that the Cd-atoms formed substitution al defects in the Sb-sublattice (Cd'(Sb)) while the S-atoms formed substitu tional defects in the Te-sublattice (S-Te((-delta))). (C) 2001 Elsevier Sci ence B.V. All rights reserved.