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The thermoelectric properties of Sr0.61Ba0.39Nb2O6 ceramics, reduced indifferent conditions, were investigated in the temperature region from 323 K to1073 K. The electrical transport behaviors of the samples are dominated by thethermal-activated polaron hopping, the Fermi glass behavior, and the Andersonlocalized behavior from low temperatures to high temperatures, respectively.The lattice thermal conductivity presents a plateau at high temperatures,indicating a glass-like thermal conduction behavior. Both the thermoelectricpower factor and the thermal conductivity increase with the increasing degreeof oxygen-reduction. Taking these two factors into account, theoxygen-reduction can still contribute to promoting the thermoelectric figure ofmerit. The highest ZT value (~0.19 at 1073 K) is obtained in the heaviestoxygen reduced sample.

Thermoelectric properties of Sr0.61Ba0.39Nb2O6-{\delta} ceramics annealed in different oxygen-reduction conditions