2016年11月
Formation of Te-rich phase and its effect on microstructure and thermoelectric properties of hot-extruded Bi-Te-Se bulk materials
JOURNAL OF ALLOYS AND COMPOUNDS
- ,
- ,
- ,
- 巻
- 684
- 号
- 開始ページ
- 516
- 終了ページ
- 523
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jallcom.2016.05.232
- 出版者・発行元
- ELSEVIER SCIENCE SA
A mechanical alloying (MA) and hot-extrusion technique was used to prepare n-type Bi-Te-Se bulk materials. The formation and distribution of Te-rich phase as well as its effect on microstructure and thermoelectric properties of the extruded samples have been investigated. The formation of Te-rich phase is mainly associated with sublimation of Te and eutectic reaction. The former occurs at any extrusion temperature and leads to formation of small-sized Te-rich phase, while the latter occurs at >= 400 degrees C and the resultant Te-rich phase possesses large sizes. The Te-rich phase was distributed in different morphologies depending on the extrusion temperature. Small-sized Te-rich phase was distributed around the grain boundaries in extruded samples. When excessive amount of Te was incorporated, the average grain size and orientation degree were found to be reduced due to formation of more Te-rich phase. Furthermore, the addition of excessive Te led to decrease of the Seebeck coefficient and increase of thermal conductivity, thus resulting in a significant reduction in ZT value. (C) 2016 Elsevier B.V. All rights reserved.
- リンク情報
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- DOI
- https://doi.org/10.1016/j.jallcom.2016.05.232
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201602218075850246
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000379792800072&DestApp=WOS_CPL
- URL
- http://jglobal.jst.go.jp/public/201602218075850246
- ID情報
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- DOI : 10.1016/j.jallcom.2016.05.232
- ISSN : 0925-8388
- eISSN : 1873-4669
- J-Global ID : 201602218075850246
- Web of Science ID : WOS:000379792800072