Effect of Nb doping on microstructures and thermoelectric properties of SrTiO3 ceramics

doi:10.1088/1674-1056/27/4/047205

Abstract Nb-doped SrTiO₃ thermoelectric ceramics with different niobium concentrations, sintering temperatures and Sr-site vacancies are successfully prepared by high energy ball milling combined with carbon burial sintering. For fully understanding the effect of niobium doping on SrTiO₃, thermoelectric transport properties are systematically investigated in a temperature range from 300 K to 1100 K. The carrier mobility can be significantly enhanced, and the electrical conductivity is quadrupled, when the sintering temperature rises from 1673 K to 1773 K (beyond the eutectic temperature (1713 K) of SrTiO₃-TiO₂). The lattice vibration can be suppressed by the lattice distortion introduced by the doped niobium atoms. However, Sr-site vacancies compensate for the lattice distortion and increase the lattice thermal conductivity more or less. Finally, we achieve a maximum value of figure-of-merit zT of 0.21 at 1100 K for SrTi_0.9Nb_0.1O₃ ceramic sintered at 1773 K.

Keywords: thermoelectric materials SrTiO₃ Nb-doped sintering temperature

Received: 08 January 2018
Revised: 24 February 2018
Accepted manuscript online:

PACS:	72.20.Pa	(Thermoelectric and thermomagnetic effects)
	72.80.Ga	(Transition-metal compounds)
	73.50.Lw	(Thermoelectric effects)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403803), the National Natural Science Foundation of China (Grant Nos. 51774065, 51525401, 51690163, and 51601028), and the Dalian Support Plan for Innovation of High-level Talents (Top and Leading Talents) (Grant No. 2015R013).

Corresponding Authors: Hui-Jun Kang
E-mail: kanghuijun@dlut.edu.cn

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Da-Quan Liu(刘达权), Yu-Wei Zhang(张玉伟), Hui-Jun Kang(康慧君), Jin-Ling Li(李金玲), Xiong Yang(杨雄), Tong-Min Wang(王同敏) Effect of Nb doping on microstructures and thermoelectric properties of SrTiO₃ ceramics 2018 Chin. Phys. B 27 047205

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Effect of Nb doping on microstructures and thermoelectric properties of SrTiO3 ceramics

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Effect of Nb doping on microstructures and thermoelectric properties of SrTiO₃ ceramics