Thermoelectric properties of oxygen deficient (K0.5Na0.5)NbO3 ceramics

Abstract The white (K 0.5 Na 0.5 )NbO 3 compound with a perovskite structure is largely studied as a lead free piezoelectric material. Pellets sintered by SPS present an oxygen deficiency and a lower resistivity. As other perovskite oxides such as SrTiO 3 or CaMnO 3 have already shown high thermoelectric properties, the thermoelectric properties of oxygen deficient (K 0.5 Na 0.5 )NbO 3 dense ceramics sintered by SPS have been investigated and appears as very promising. Dimensionless figure of merit ZT at 1000 K is 0.012.