Abstract
In the present study, p-type (Bi,Sb) 2Te 3 thermoelectric materials have been fabricated through the spark plasma sintering (SPS) method by using powders with various particle sizes. Electrical conductivity ( σ), Seebeck coefficient ( α), and thermal conductivity ( κ) were evaluated in the temperature range of 300–500 K. The effect of annealing of the sintered samples on thermoelectric properties was also investigated. The maximum figure of merit ZT (ZT = α 2 σT/ κ) of the sintered samples in the direction perpendicular to the pressing direction (with c-axis preferred orientation) was 1.15 at about 350 K, corresponding to be about 115% of that of the zone-melted ingot with the same composition in the same crystallographic orientation; while the bending strength was highly improved from about 10 to 80 MPa.
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