Enhanced thermoelectric performance of high pressure synthesized Sb-doped Mg2Si
| Autor: | Fengrong Yu, Qian Zhang, Long Zhang, Bo Xu, Jianghua Li, Zhisheng Zhao, Yongjun Tian, Xiaopu Li, Bowen Cai, Chen Chen, Dongli Yu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Volatilisation Mechanical Engineering Doping Metals and Alloys Spark plasma sintering 02 engineering and technology Power factor 010402 general chemistry 021001 nanoscience & nanotechnology Magnesium silicide Thermoelectric materials 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials High pressure Thermoelectric effect Materials Chemistry 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 741:1148-1152 |
| ISSN: | 0925-8388 |
| Popis: | n-type Mg2Si1-xSbx compounds were prepared within a short duration by using high pressure synthesis followed by spark plasma sintering. The structural and compositional characterizations indicated highly densified single-phase products with no obvious oxidation or volatilization of Mg. High pressure synthesized samples showed greatly enhanced thermoelectric performance compared with ambient-pressure synthesized ones. For the optimal Mg2Si0.985Sb0.015, the power factor reached 3300 μWm−1K−2 at 773 K meanwhile the lattice thermal conductivity was suppressed to 1.0 Wm−1K−1 at temperatures higher than 700 K. As a result, the highest ZT of 0.94 was achieved at 873 K. High pressure synthesis thus provides us an alternative and effective pathway to synthesize magnesium silicide based thermoelectric materials. |
| Databáze: | OpenAIRE |
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