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Enhancing Figure of Merit of Bi 0 . 5 Sb 1 . 5 Te 3 Through Nanocomposite Approach
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hsu, Hung Chang Huang, Jing-Yi Huang, Tsai-Kun |
| Copyright Year | 2015 |
| Abstract | Bi0.5Sb1.5Te3 nano-composites were fabricated through a hot pressing process, where powder was prepared by mixing various ratios (0, 20, 40 and 100 wt%) of micro-grain and nano-grain Bi0.5Sb1.5Te3 powder. The micro-grain powder was obtained by grinding a zone-melting Bi0.5Sb1.5Te3 ingot. The nano-grain powder was obtained by grinding a melt-spun Bi0.5Sb1.5Te3 ribbon. The melt spun ribbons are composed of 5-10 nm nano-grains. The microstructure of the Bi0.5Sb1.5Te3 nano-composite shows that the micro-grain powder is surrounded by the melt spun powder. The grain size of the melt spun powder remained the same after hot pressing. The highest figure of merit, ZTmax~1.2@400K, was obtained for Bi0.5Sb1.5Te3 nano-composite with mixing 40 wt% of melt-spun powder. After further annealing at 300°C, ZT was enhanced to 1.42. A SEM image shows there are aggregated Te-rich precipitations in the annealed sample. The aggregated Te-rich precipitations could result in a carrier energy filtering effect leading to the increase of the Seebeck coefficient, from 188 to 236 V/K at room temperature. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.csc.com.tw/csc_c/ts/ena/pdf/no27/08-Enhancing%20Figure%20of%20Merit%20of%20Bi0.5Sb1.5Te3%20Through%20Nano-composite%20Approach.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
