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Synthesis and Thermoelectric Properties of the B-Site Substituted SrTiO<sub>3</sub> with Vanadium
Khan, Tamal Tahsin,Mahmud, Iqbal,Ur, Soon-Chul Materials Research Society of Korea 2017 한국재료학회지 Vol.27 No.8
V-substituted $SrTiO_3$ thermoelectric oxide materials were fabricated by the conventional solid state reaction method. From X-ray diffraction pattern analysis, it can be clearly seen that almost every vanadium atom incorporated into the $SrTiO_3$ provided charge carriers. The electrical conductivity ${\sigma}$, Seebeck coefficient S, and thermal conductivity k were investigated in a high temperature regime above 1000 K. The addition of vanadium significantly reduced the thermal conductivity and enhanced the Seebeck coefficient, as well as the electrical conductivity, thus enhancing the ZT value. A maximum ZT value of 0.084 at 673 K was observed for the sample with 1.0 mole% of vanadium substitution. In this study, the reason for the enhanced thermoelectric properties via vanadium addition was also investigated.
Thermoelectric Properties of the Yttrium-Doped Ceramic Oxide SrTiO3
Tamal Tahsin Khan,어순철 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.1
The doping dependence of the thermoelectric figure of merit, ZT, of the ceramic oxide SrTiO3 at high temperature has been studied. In this study, yttrium was used as the doping element. A conventional solid-state reaction method was used for the preparation of Y-doped SrTiO3. The doping level in SrTiO3 was controlled to be in the doping range of 2 - 10 mole%. Almost all the yttrium atoms incorporated into the SrTiO3 provided charge carriers, as was observed by using X-ray diffraction pattern. The relative densities of all the samples varied from 98.53% to 99.45%. The thermoelectric properties, including the electrical conductivity σ, Seebeck coefficient S, thermal conductivity k, and the figure of merit, ZT, were investigated at medium temperatures. The ZT value showed an obvious doping level dependence, in which a value as high as 0.18 is realized at 773 K for a doping of 8 mole%.
Enhanced thermoelectric properties of the SrTiO3 by Zr-doping with different doping level
Tamal Tahsin Khan,김일호,어순철 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4
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.