Thermoelectric enhancement in triple-doped strontium titanate with multi-scale microstructure

Zheng Cao, Qing Qiao Fu, Hui Gu, Zhen Tian, Xinba Yaer, Juan Juan Xing, Lei Miao, Xiao Huan Wang, Hui Min Liu, Jun Wang

研究成果査読

抄録

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/microsized 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.

本文言語English
論文番号097204
ジャーナルChinese Physics B
30
9
DOI
出版ステータスPublished - 2021 9
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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