| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Thermoelectric enhancement in triple-doped strontium titanate with multi-scale microstructure |
| Zheng Cao(曹正)1,†, Qing-Qiao Fu(傅晴俏)2,†, Hui Gu(顾辉)2, Zhen Tian(田震)1, Xinba Yaer(新巴雅尔)1, Juan-Juan Xing(邢娟娟)2,‡, Lei Miao(苗蕾)3, Xiao-Huan Wang(王晓欢)1, Hui-Min Liu(刘慧敏)1, and Jun Wang(王俊)1,§ |
1 Inner Mongolia Engineering Research Center of Multi-functioanl Copper Based Materials, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2 School of Materials Science and Engineering, Materials Genome Institute, Shanghai University, Shanghai 200444, China;
3 School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China |
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Abstract Strontium titanate (SrTiO3) is a thermoelectric material with large Seebeck coefficient that has potential applications in high-temperature power generators. To simultaneously achieve a low thermal conductivity and high electrical conductivity, polycrystalline SrTiO3 with a multi-scale architecture was designed by the co-doping with lanthanum, cerium, and niobium. High-quality nano-powders were synthesized via a hydrothermal method. Nano-inclusions and a nano/micro-sized second phase precipitated during sintering to form mosaic crystal-like and epitaxial-like structures, which decreased the thermal conductivity. Substituting trivalent Ce and/or La with divalent Sr and substituting pentavalent Nb with tetravalent Ti enhanced the electrical conductivity without decreasing the Seebeck coefficient. By optimizing the dopant type and ratio, a low thermal conductivity of 2.77 W·m-1·K-1 and high PF of 1.1 mW·m-1·K-2 at 1000 K were obtained in the sample co-doped with 5-mol% La, 5-mol% Ce, and 5-mol% Nb, which induced a large ZT of 0.38 at 1000 K.
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Received: 27 January 2021
Revised: 15 February 2021
Accepted manuscript online: 25 February 2021
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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84.60.Rb
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(Thermoelectric, electrogasdynamic and other direct energy conversion)
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77.84.Cg
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(PZT ceramics and other titanates)
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81.20.-n
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51702168 and 51532006). |
Corresponding Authors:
Juan-Juan Xing, Jun Wang
E-mail: xingjuanjuan@shu.edu.cn;wangjun@imut.edu.cn
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Cite this article:
Zheng Cao(曹正), Qing-Qiao Fu(傅晴俏), Hui Gu(顾辉), Zhen Tian(田震), Xinba Yaer(新巴雅尔), Juan-Juan Xing(邢娟娟), Lei Miao(苗蕾), Xiao-Huan Wang(王晓欢), Hui-Min Liu(刘慧敏), and Jun Wang(王俊) Thermoelectric enhancement in triple-doped strontium titanate with multi-scale microstructure 2021 Chin. Phys. B 30 097204
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