Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 58, Issue -, Pages 10-15Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.05.015
Keywords
Thermoelectric material; SnSe; Valence mapping; Defect evolution; Power factor
Funding
- National Natural Science Foundation of China [51772176]
- Scienceand Technology Development Project of Shandong Province [2019JZZY010303]
- Shandong Natural Science Foundation Project [ZR2015EM013]
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Defect existing form and its evolution play an important role in the thermoelectric transport process. Here different forms of Pb into the SnSe system were introduced in order to improve the thermoelectric and mechanical properties of SnSe. Pb/SnSe samples were fabricated by vacuum melting, solid phase diffusion, spark plasma sintering and annealing treatment. The element valence mapping diagram and the X-ray photoelectron spectra (XPS) characteristic peaks of Pb show that a certain amount of elemental Pb exists in the initial state, and evolves into Pb-2(+) ion after annealing treatment. The micro-structure evolution leads to significant enhancement of the power factor and the ZT value. The power factor (PF) and the ZT value for Pb/SnSe increases to 623 mu W/m/K-2 and 1.12 at 773 K after annealing treatment, respectively. Compared with SnSe matrix, the hardness and fracture toughness of Pb/SnSe samples increased by about 40% and 10%, respectively. Reasonable control of microstructure evolution is expected to be a design idea to improve thermoelectric and mechanical properties of SnSe. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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