Polycrystalline SnO 2 -based samples (Sn 0.97Àx Sb 0.03 Zn x O 2 , x = 0, 0.01, 0.03) were prepared by solid-state reactions. The thermoelectric properties of SnO 2 doped with Sb and Zn were investigated from 300 K to 1100 K. X-ray diffraction (XRD) analysis revealed all XRD peaks of all the samples as identical to the rutile structure, except for the x = 0.03 sample, which had a small amount of Zn 2 SbO 4 as a secondary phase. We found that the power factor of the x = 0.03 sample was significantly improved due to the simultaneous increase in the electrical conductivity and the Seebeck coefficient. A power factor value of $2 9 10 À4 W m À1 K À2 was obtained for the x = 0.03 sample at 1060 K, 126% higher than that for the undoped sample.
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