The enhancement of the thermoelctric properties of the SrTiO3 by doping with Zr were investigated in our study. The Zrdoped SrTiO3 with different doping level were synthesized by the conventional solid-state reaction method. The formation of single phase cubic perovskite structure and the changing behavior of the average grain size confirmed that the Zr-doped SrTiO3 were prepared to control doping level. The thermoelctric properties including Seebeck coefficient, electrical conductivity, and thermal conductivity has been investigated in a moderate temperature regime from 300 K to 1000 K. The absolute value of Seebeck coefficient decreased and the electrical conductivity increased monotonically with increasing doping level. The thermal conductivity decreased with increasing doping level. The power factor increased with increasing doping level-up to x = 0.03 mole and the dimensionless figure of merit ZT, increased up to x = 0.03 mole of Zr. The maximum ZT value was observed for SrTi0.97Zr0.03O3 at 873 K.

Keywords: Ceramic oxide, Doping, Thermoelectric properties, Ball mill, Vacuum hot-pressing