Thermoelectric Properties of P -Type BaSnO₃ Ceramics Doped with Cobalt

抄録

Perovskite-type BaSn_1-xCo_xO_3-δ ceramics were prepared by a solid state reaction, and the electrical conductivity σ and Seebeck coefficient S were measured in the temperature range 373-1073 K to evaluate the thermoelectric power factors S²σ. Dense ceramics with relative densities of ∼98 % were obtained by firing at 1573 K for the BaSn_1-xCo_xO_3-δ with x=0.03-0.15. Temperature dependence of σ and S showed that the BaSn_1-xCo_xO_3-δ ceramics with x=0.03-0.15 were p-type semiconductors. A possible origin of the p-type conduction is hopping of holes between localized states of Co ions. The S²σ values were in the orders of 10^-11-10^-7 Wm^-1K^-2 and the highest value was 2.7×10^-7 Wm^-1K^-2 at 1073 K for x=0.15.