Low-Temperature Transport Properties of Bi-Substituted [beta]-As^sub 2^Te^sub 3^ Compounds

Issue Title: 2015 International Conference on Thermoelectrics. Guest Editors: Jihui Yang, Matt Beekman, Donald Morelli, James Salvador, David Singh, Hsin Wang, Emmanuel Guilmeau, Juri Grin, Bertrand Lenoir, Xinfeng Tang, Wenqing Zhang, Chunlei Wan, TieJun Zhu, Ryoji Funahashi, Takao Mori, Tsunehiro...

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Bibliographic Details
Published in:Journal of electronic materials 2016-03, Vol.45 (3), p.1786
Main Authors: Vaney, J -b, Carreaud, J, Delaizir, G, Morin, C, Monnier, J, Alleno, E, Piarristeguy, A, Pradel, A, Gonçalves, A P, Lopes, E B, Candolfi, C, Dauscher, A, Lenoir, B
Format: Article
Language:English
Subjects:
Alloys
Electric properties
Low temperature physics
Thermodynamics
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Summary:Issue Title: 2015 International Conference on Thermoelectrics. Guest Editors: Jihui Yang, Matt Beekman, Donald Morelli, James Salvador, David Singh, Hsin Wang, Emmanuel Guilmeau, Juri Grin, Bertrand Lenoir, Xinfeng Tang, Wenqing Zhang, Chunlei Wan, TieJun Zhu, Ryoji Funahashi, Takao Mori, Tsunehiro Takeuchi, Sabah Bux [beta]-As^sub 2^Te^sub 3^ belongs to the family of Bi^sub 2^Te^sub 3^-based alloys, a well-known class of efficient thermoelectric materials around room temperature. As^sub 2^Te^sub 3^ exists in two allotropic configurations: [alpha]- and [beta]-As^sub 2^Te^sub 3^, of which only the latter crystallizes in the same rhombohedral structure as Bi^sub 2^Te^sub 3^. Herein, we report on substitution of Bi for As in the As^sub 2-x^Bi^sub x^Te^sub 3^ system with x = 0.0, 0.015, 0.025, and 0.035. These samples have been characterized by x-ray diffraction and scanning electron microscopy. The transport properties have been measured at low temperatures (5 K to 300 K) in both directions, parallel and perpendicular to the pressing direction. The results are compared with those obtained in previous study on samples substituted by Sn. Compared with Sn, Bi allows for a clear decrease in electrical resistivity while maintaining the thermal conductivity below 1 W/(m K) over the whole temperature range. As a result, a comparable peak ZT value near 0.2 was obtained at room temperature.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-015-4227-1