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Influence of powder morphology on thermoelectric anisotropy of spark-plasma-sintered Bi-Te-based thermoelectric materials

Title
Influence of powder morphology on thermoelectric anisotropy of spark-plasma-sintered Bi-Te-based thermoelectric materials
Authors
Kim, DH[Kim, Dong Hwan]Kim, C[Kim, Cham]Heo, SH[Heo, Seong Hyeon]Kim, H[Kim, Hoyoung]
DGIST Authors
Kim, DH[Kim, Dong Hwan]Kim, C[Kim, Cham]; Heo, SH[Heo, Seong Hyeon]; Kim, H[Kim, Hoyoung]
Issue Date
2011-01
Citation
Acta Materialia, 59(1), 405-411
Type
Article
Article Type
Article
Keywords
Anisotropic BehaviorsAnisotropyElectric ConductivityElectric SparksElectrical ResistivityFlake-Like ShapesMorphologyNano-Sized ParticlesP-TypePlasmasPowder MorphologyPowdersSintered BodySpark PlasmaSpark Plasma SinteringSpherical ShapeStarting PowdersTellurium CompoundsThermo-ElectricThermo-Electric EquipmentThermo-Electric MaterialThermo-Electric PropertiesThermo-Electricity
ISSN
1359-6454
Abstract
The influence of the starting powders' morphology on the thermoelectric anisotropy of Bi-Te-based thermoelectric materials that are fabricated by spark plasma sintering has been investigated. Starting powders with three types of morphologies are prepared through a chemical reaction method (nano-sized particles with a spherical shape), a conventional pulverization method (flake-like shape) and a gas atomizing method (spherical shape). The thermoelectric anisotropy of each sintered body is determined by measuring the electrical resistivity and thermal conductivity in both the parallel and perpendicular directions to the spark plasma sintering pressing direction. The p-type Bi0.5Sb1.5Te3.0-sintered body that is composed of the spherically shaped powder has isotropic thermoelectric properties, while the same material composed of the flake-like powder shows anisotropic behavior. The n-type Bi2Te3 sintered body has a relatively small anisotropy when it is composed from the spherically shaped powder. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3471
DOI
10.1016/j.actamat.2010.09.054
Publisher
Elsevier Ltd
Related Researcher
Files:
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Collection:
ETC1. Journal Articles


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