Thermoelectric properties of Nb-doped Sr1−x (La0.5Na0.5) x TiO3 perovskites

Abstract

We report the thermal conductivity (κ) of perovskite Sr1−x (La0.5Na0.5) x TiO3 (0 ≤ x ≤ 1) and the thermoelectric properties of Nb-doped samples for x = 0.1 and 0.2. The κ of the solid solution shows a distinct minimum near the cubic-tetragonal phase boundary at x = 0.2, where the value becomes close to the minimum theoretical κ. Nb doping to x = 0.2 retains the high power factor found in Nb-doped SrTiO3, but also raises the κ to result in a thermoelectric figure of merit of 0.24 at 773 K.