期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.09.044
关键词
Bismuth telluride; Crystallographic texture; Deformation structures; EBSD
类别
资金
- AFRL/ASEE Summer Faculty Fellowship Program (SFFP)
- National Research Council Research Associate award at the Air Force Research Laboratory
The n-type bismuth telluride alloy Bi2Se0.3Te2.7 was subject to hot deformation under several deformation conditions, such as extrusion, sandwich rolling, and plane strain compression. The resulting crystallographic texture is found to depend on the initial texture, strain imposed during deformation, the type of deformation, and proximity to the die surface. Bismuth telluride has a trigonal crystal structure, based on a hexagonal lattice with a c/a ratio of 6.96. During rolling, the material develops a rolling fiber texture in which the [0001] is oriented perpendicular to the rolling plane and the < 11 (2) over bar0 > directions are randomly oriented in the plane of rolling. This texture is typically observed in a low c/a ratio material like magnesium. Measurement of the thermoelectric transport properties indicate that n-type bismuth telluride with a rolling fiber texture can have a non-dimensional figure of merit ZT of almost 1 at room temperature. (C) 2013 Elsevier B.V. All rights reserved.
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