Mechanical and Thermoelectric Performance of p-type Bi-Sb-Te Prepared by Hot Pressing

Abstract

P-type (Sb₂Te₃)₇₅(Bi₂Te₃ )₂₅+xTe (x = 2, 3, 4, 5, wt %) was prepared by single-axis hot pressing. The performances of the samples were reported and discussed in this paper. SEM was made to observe the typical microstructure. Density and bending strength were observed for analyzing the dependence of content of telluride on strength. Electric conductivity and Seebeck coefficient were measured, power factor was calculated, and telluride dependence of thermoelectric properties was analyzed. By analysis, we found that there were evident relation among content of telluride dependence of morphology, density, bending strength and thermoelectric properties. Power factor of Bi-Sb-Te doped with 4wt% telluride was the highest, with alpha = 0.209mV7K, sigma = 90.253(Omega-mm)^-1, alpha²sigma =3.951 mW/K ²middotm