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

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

中国物理B ›› 2018, Vol. 27 ›› Issue (4): 47205-047205.doi: 10.1088/1674-1056/27/4/047205

所属专题： SPECIAL TOPIC — Recent advances in thermoelectric materials and devices

• TOPIC REVIEW—Thermal and thermoelectric properties of nano materials • 上一篇下一篇

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

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)

Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

收稿日期:2018-01-08 修回日期:2018-02-24 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: Hui-Jun Kang E-mail:kanghuijun@dlut.edu.cn
基金资助:
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).

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

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)

Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Received:2018-01-08 Revised:2018-02-24 Online:2018-04-05 Published:2018-04-05
Contact: Hui-Jun Kang E-mail:kanghuijun@dlut.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: thermoelectric materials, SrTiO₃, Nb-doped, sintering temperature

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.

Key words: thermoelectric materials, SrTiO₃, Nb-doped, sintering temperature

中图分类号: (Thermoelectric and thermomagnetic effects)

72.20.Pa

72.80.Ga (Transition-metal compounds) 73.50.Lw (Thermoelectric effects)

刘达权, 张玉伟, 康慧君, 李金玲, 杨雄, 王同敏. Effect of Nb doping on microstructures and thermoelectric properties of SrTiO₃ ceramics[J]. 中国物理B, 2018, 27(4): 47205-047205.

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[J]. Chin. Phys. B, 2018, 27(4): 47205-047205.

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

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

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