Thermoelectric property study of Bi₂Te₃-Sb₂Te₃ mixed crystals

Polycrystalline Bi₂Te₃-Sb₂Te₃ mixed crystals are synthesized by solid state reaction method. Structural characterizations are carried out using X-Ray diffraction (XRD). Thermal variation of resistivity data, measured down to 10 K, shows that there is a transition from semiconducting to metallic behavior for 80% Sb containing sample. Temperature dependent thermopower measurement is carried out using differential technique in the temperature range 300–20 K. Thermopower data shows all the samples are p-type in nature. Power factor of the samples are also estimated.