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The Bi-doped Mg2Si0:8Sn0:2 single phase compound is prepared by a solid state reaction (SSR)-spark plasma sintering (SPS) method. The effect of the Bi content on the thermoelectric properties of the Bi-doped Mg2Si0:8Sn0:2 compound is mainly investigated. The results show that the thermoelectric properties of the obtained samples are sensitive to the Bi content. With the increase in Bi content, the electrical conductivity ( ) and Seebeck coefficient ( ) of the samples are increased, while the thermal conductivity ( ) is decreased slightly between 300 K and 850 K. When the Bi content is greater than 3.0 at%, the sample shows a maximum figure of merit (ZT) value (1:17  0:05) at 850 K. [doi:10.2320/matertrans.MC200908]

Preparation and Thermoelectric Properties of Bi-Doped Mg<SUB>2</SUB>Si<SUB>0.8</SUB>Sn<SUB>0.2</SUB> Compound