Design and Optimization of Gradient Interface of Ba0.4In0.4Co4Sb12/Bi2Te2.7Se0.3 Thermoelectric Materials

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• 作者：Gang Liu (1)
  Wen-Yu Zhao (1) wyzhao@whut.edu.cn
  Hong-Yu Zhou (1)
  Ping Wei (1)
  Jian Yu (1)
  Ding-Guo Tang (1)
  Qing-Jie Zhang (1) zhangqj@whut.edu.cn
• 关键词：Ba0.4In0.4Co4Sb12/Bi2Te2.7Se0.3 thermoelectric materials &#8211 ; gradient interface &#8211 ; microstructure &#8211 ; mechanical properties
• 刊名：Journal of Electronic Materials
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：41
• 期：6
• 页码：1376-1382
• 全文大小：1.1 MB
• 参考文献：1. M. Kubo, T. Itoh, K. Tokuda, J. Shan, and K. Kitagawa, 22nd International Conference on Thermoelectrics (La Grande Motte, France: IEEE, 2003).
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• 作者单位：1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer US
• ISSN：1543-186X

文摘

A series of Ba_0.4In_0.4Co₄Sb₁₂/Bi₂Te_2.7Se_0.3 (FS/BT) thermoelectric (TE) materials were fabricated by a two-step spark plasma sintering method. The samples contained various numbers of gradient layers between FS and BT as follows: one gradient layer (1GL) with FS/BT volume ratio of 5:5, three GLs with ratios of 3:7, 5:5, and 7:3 (denoted as 3GLs-I with 3:7–5:5–7:3), 3GLs-II with 7:3–5:5–3:7, 5GLs-I with 3:7–4:6–5:5–6:4–7:3, and 5GLs-II with 2:8–3:7–5:5–7:3–8:2. The interfacial structure and mechanical properties of the FS/BT TE materials were investigated in this work. In FS/BT TE materials with no GLs, a large number of macroscopic cracks occurred on the FS bulk material side. It was discovered that designing and optimizing GLs between the FS and BT bulk materials could effectively relax the thermal stress induced by the large difference in coefficient of thermal expansion, eliminating the macroscopic cracks and resulting in a remarkable enhancement of the interfacial mechanical properties of the FS/BT TE materials. The flexural strength of the FS/BT TE material with 1GL reached 9.67 MPa, increased by 85% compared with that of the FS/BT TE material with no GLs. The present work indicates that increasing the BT content in the GL near to the FS bulk material side is an effective method to completely eliminate macroscopic cracking. The optimized gradient interface of the FS/BT TE material was 3GLs-II with FS/BT volume ratios of 3:7–5:5–7:3. The highest flexural strength reached 12.76 MPa, representing a 144% increase.