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Thermoelectric properties of c-axis aligned Bi-Te materials

Title
Thermoelectric properties of c-axis aligned Bi-Te materials
Authors
Kim, HoyoungKim, Dong HwanKim, ChamPark, SangHa
DGIST Authors
Kim, HoyoungKim, Dong HwanKim, Cham
Issue Date
2012
Citation
9th European Conference on Thermoelectrics, ECT 2011, 1449, 139-142
Type
Conference
Article Type
Conference Paper
ISBN
9780000000000
ISSN
0094-243X
Abstract
Single crystalline Bi-Te thermoelectric materials have a rhombohedral structure with van der Waals bonding along c-axis direction. This structure gives intrinsic anisotropy in thermoelectric properties like electrical resistivity, thermal conductivity, Seebeck coefficient, as well as electron/hall mobility. Recent research works report that nano structures in polycrystalline thermoelectric materials improve thermoelectric performance by reducing thermal conductivity or by enhancing Seebeck coefficient. We investigated the effect of adjusting crystal orientation in the microstructures containing sub micro-sized grains on the thermoelectric properties for polycrystalline Bi-Te materials. Bi-Te powder, prepared through the conventional pulverization process, was sufficiently dispersed in an appropriate solvent, and then was formed into c-axis aligned green body under a designated high magnetic field. The green bodies were sintered with spark-plasma-sintering machine. The degree of crystal alignment of sintered bodies was examined with the electron-back-scatter- diffraction SEM and the X-ray diffraction patterns. It was observed that for p-type thermoelectric Bi-Te materials, aligning crystal orientation properly made electrical resistivity in the preferred direction decreased with keeping Seebeck coefficient and thermal conductivity remained unchanged. © 2012 American Institute of Physics.
URI
http://hdl.handle.net/20.500.11750/5530
DOI
10.1063/1.4731516
Publisher
American Institute of Physics Publishing
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group2. Conference Papers


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