Enhanced thermoelectric properties of the SrTiO3 by Zr-doping with different doping level
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The enhancement of the thermoelctric properties of the SrTiO3 by doping with Zr were investigated in our study. The ZrdopedSrTiO3 with different doping level were synthesized by the conventional solid-state reaction method. The formation ofsingle phase cubic perovskite structure and the changing behavior of the average grain size confirmed that the Zr-dopedSrTiO3 were prepared to control doping level. The thermoelctric properties including Seebeck coefficient, electricalconductivity, and thermal conductivity has been investigated in a moderate temperature regime from 300 K to 1000 K. Theabsolute value of Seebeck coefficient decreased and the electrical conductivity increased monotonically with increasing dopinglevel. The thermal conductivity decreased with increasing doping level. The power factor increased with increasing dopinglevel-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 valuewas observed for SrTi0.97Zr0.03O3 at 873 K.
Abstract
The enhancement of the thermoelctric properties of the SrTiO3 by doping with Zr were investigated in our study. The ZrdopedSrTiO3 with different doping level were synthesized by the conventional solid-state reaction method. The formation ofsingle phase cubic perovskite structure and the changing behavior of the average grain size confirmed that the Zr-dopedSrTiO3 were prepared to control doping level. The thermoelctric properties including Seebeck coefficient, electricalconductivity, and thermal conductivity has been investigated in a moderate temperature regime from 300 K to 1000 K. Theabsolute value of Seebeck coefficient decreased and the electrical conductivity increased monotonically with increasing dopinglevel. The thermal conductivity decreased with increasing doping level. The power factor increased with increasing dopinglevel-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 valuewas observed for SrTi0.97Zr0.03O3 at 873 K.
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