P-type thermoelectric Bi 0.5 Sb 1.5 Te 3 compounds were prepared by the spark plasma sintering method with temperature ranges of 300-420 • C and powder sizes of ∼75 μm, 76-150 μm, 151-250 μm. As the sintering temperature increased, the electrical resistivity and thermal conductivity of the compound were greatly changed due to an increase in the relative density. The Seebeck coefficient and electrical resistivity were varied largely with decreasing the powder size. Subsequently, the compound sintered at 380 • C with the powders of ∼75μm showed the maximum figure-of-merit of 2.65 × 10 −3 K −1 and the bending strength of 73 MPa.
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