Microwave activated hot pressing: A new opportunity to improve the thermoelectric properties of ntype Bi2Te3xSex bulks
[Display omitted] A new consolidation method of Microwave Activated Hot Pressing was introduced.Bi2Te3-xSex bulks were prepared by Microwave Activated Hot Pressing.The doped selenium promotes grain refinement and thermoelectric properties.A minimum thermal conductivity of 0.85Wm1K1 was achieve...
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Published in | Materials research bulletin Vol. 83; pp. 122 - 127 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.11.2016
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
A new consolidation method of Microwave Activated Hot Pressing was introduced.Bi2Te3-xSex bulks were prepared by Microwave Activated Hot Pressing.The doped selenium promotes grain refinement and thermoelectric properties.A minimum thermal conductivity of 0.85Wm1K1 was achieved for Bi2Te2.4Se0.6.
In this article, ntype Bi2Te3xSex (x=0.15, 0.3, 0.45, 0.6) compounds were prepared successfully via a new consolidation technique named Microwave Activated Hot Pressing (MAHP) to explore the optimum composition with the best thermoelectric properties. The results showed that the relatively low sintering temperature and short holding time used in this work could suppress grain growth. The sintered samples showed a typical multiscale microstructure, consisting of fine lamellar grains and irregular granular grains. Moreover, the doped selenium promoted grain refinement. With the variation of selenium content, a highest power factor of 1.75ÿ103Wm1K2 was achieved for Bi2Te2.7Se0.3 sample around 423K. And a minimum thermal conductivity of 0.85Wm1K1 was achieved around 423K for Bi2Te2.4Se0.6 sample. Considering the comprehensive thermoelectric properties, a highest ZT value of 0.73 was obtained for Bi2Te2.55Se0.45 sample around 423K. |
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ISSN: | 0025-5408 1873-4227 |
DOI: | 10.1016/j.materresbull.2016.05.030 |