Thermoelectric properties of P-type BaSnO3 ceramics doped with cobalt

Abstract

Perovskite-type BaSn1-xCoxO3-δ ceramics were prepared by a solid state reaction, and the electrical conductivity δ and Seebeck coefficient S were measured in the temperature range 373-1073 K to evaluate the thermoelectric power factors S 2δ. Dense ceramics with relative densities of ∼ 98% were obtained by firing at 1573 K for the BaSn1-xCoxO 3-δ with x = 0.03-0.15. Temperature dependence of a and S showed that the BaSn1-xCoxO3-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 S 2δ values were in the orders of 10-11-10 -7 Wm-1K-2 and the highest value was 2.7X 10-7 Wm-1TK-2 at 1073 K for x = 0.15.