Ultrahigh electrical conductivities and low lattice thermal conductivities of La, Dy, and Nb Co-doped SrTiO3 thermoelectric materials with complex structures
Ultrahigh electrical conductivities and low lattice thermal conductivities of La, Dy, and Nb Co-doped SrTiO3 thermoelectric materials with complex structures
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DOI：
10.1016/j.jmst.2020.02.065
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发表时间：
2020-09-01
影响因子：
10.9
通讯作者：
Wang, Tongmin
中科院分区：
文献类型：
--
作者：
Liu, Daquan;Wang, Yanxia;Wang, Tongmin
Microstructural modifications and appropriate element doping are necessary to simultaneously enhance the electrical conductivities and reduce the lattice thermal conductivities of thermoelectric materials. Herein, we propose a strategy of multielement doping combined with a burial sintering process to promote thermoelectric properties. Three-element doped Sr-0.(9) La0.05Dy0.05Ti1-xNbxO3 ( x = 0, 0.05, 0.10, 0.15, and 0.20) powders were synthesized by high-energy ball milling, and corresponding bulk samples were prepared by carbon burial sintering. In the bulk samples, we obtained the desired microstructures composed of shell-vesicular architectures with dense dislocations and second phase particles. These materials had ultrahigh electrical conductivities (similar to 5300 S cm(-1) at 300 K), low lattice thermal conductivities (similar to 1.6 W m(-1) K-1 from 700 to 1100 K when x = 0.2) and low total thermal conductivities (minimum value of 2.95 W m(-1) K-1 when x = 0.05 at 1100 K). The maximum zT values were 0.28 when x = 0.05 and 0.27 when x = 0.2 at 1100 K. This strategy provides a possible direction for improving the thermoelectric properties of SrTiO3 based materials. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
