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.
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26 June 2012
9TH EUROPEAN CONFERENCE ON THERMOELECTRICS: ECT2011
28–30 September 2011
Thessaloniki, Greece
Research Article|
June 26 2012
Thermoelectric properties of c-axis aligned Bi-Te materials
Hoyoung Kim;
Hoyoung Kim
DGIST, 50-1 Sang-ri Hyeonpung-myeon Dalseong-gun Daegu, 711-873,
Republic of Korea
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Dong Hwan Kim;
Dong Hwan Kim
DGIST, 50-1 Sang-ri Hyeonpung-myeon Dalseong-gun Daegu, 711-873,
Republic of Korea
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Cham Kim;
Cham Kim
DGIST, 50-1 Sang-ri Hyeonpung-myeon Dalseong-gun Daegu, 711-873,
Republic of Korea
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SangHa Park
SangHa Park
DMI, 12 Horim-dong Dalseo-gu Daegu, 704-240,
Republic of Korea
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AIP Conf. Proc. 1449, 139–142 (2012)
Citation
Hoyoung Kim, Dong Hwan Kim, Cham Kim, SangHa Park; Thermoelectric properties of c-axis aligned Bi-Te materials. AIP Conf. Proc. 26 June 2012; 1449 (1): 139–142. https://doi.org/10.1063/1.4731516
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