期刊
MATERIALS LETTERS
卷 203, 期 -, 页码 5-8出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.05.120
关键词
Thermoelectric; SPS; Grain boundary; Nanostructures
资金
- National Natural Science Foundation of China [51602272, 51572111]
- Natural Science Foundation of Fujian Province [2016J01745]
- Education and scientific research projects of young and middle-aged teachers in Fujian Province [JA15366]
- State Key Laboratory for Mechanical Behavior of Materials
A series of typical samples based on beta-Zn4Sb3 have been prepared by spark plasma sintering. Single-phase beta-Zn4Sb3 sample is found to be a brittle material. Many hole defects are found in single-phase sample after chemical etching. A small amount of excess metallic Zn reduces the hole defects and improves the thermoelectric performance of Zn-rich sample. The maximum ZT can reach 1.31 at 673 K. The improvement of performance can be attributed to hierarchical nanometer precipitates and interface stress. Introducing soft metal into particle boundaries is a potential solution to improve the performance of brittle polycrystalline thermoelectric materials. (C) 2017 Elsevier B.V. All rights reserved.
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