PUB-2014-SEI

Significant enhancement in thermoelectric properties of polycrystalline Pr-doped SrTiO3− δ ceramics originating from nonuniform distribution of Pr dopants

AM Dehkordi, S Bhattacharya, J He, H.N. Alshareef, TM Tritt, “Significant enhancement in thermoelectric properties of polycrystalline Pr-doped SrTiO3− δ ceramics originating from nonuniform distribution of Pr dopants”
Appl. Phys. Lett. 104, 193902 (2014)
AM Dehkordi, S Bhattacharya, J He, H.N. Alshareef, TM Tritt
Doping, Thermal conductivity, Ceramics
2014
Recently, we have reported a significant enhancement ( >70% at 500 °C) in the thermoelectricpower factor () of bulk polycrystalline Pr-doped SrTiO ceramics employing a novel synthesis strategy which led to the highest ever reported values of  among doped polycrystalline SrTiO. It was found that the formation of Pr-rich grain boundary regions gives rise to an enhancement in carrier mobility. In this Letter, we investigate the electronic and thermal transport in Sr PrTiO ceramics in order to determine the optimum doping concentration and to evaluate the overallthermoelectric performance. Simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity in these samples resulted in more than 30% improvement in the dimensionless thermoelectric figure of merit () for the whole temperature range over all previously reported maximum values. Maximum ZT value of 0.35 was obtained at 500 °C.