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Fabrication and thermoelectric properties of c-axis-aligned Bi0.5Sb1.5Te3 with a high magnetic field

Title
Fabrication and thermoelectric properties of c-axis-aligned Bi0.5Sb1.5Te3 with a high magnetic field
Authors
Kim, Dong HwanKim, ChamJe, Koo-ChulHa, Gook HyunKim, Hoyoung
DGIST Authors
Kim, Dong HwanKim, ChamKim, Hoyoung
Issue Date
2011-07
Citation
Acta Materialia, 59(12), 4957-4963
Type
Article
Article Type
Article
Keywords
AlignmentCrystal AlignmentCrystal OrientationElectric ConductivityElectric SparksElectrical ResistivityExperimental ProcedureHigh Magnetic FieldHigh Magnetic FieldsHole MobilityMagnetic FieldsPolycrystallinePowdersRandom OrientationsRotating Magnetic FieldsSequential ProcessSinter MachinesSlip-CastingSpark PlasmaSpark Plasma SinteringTheoretical EvaluationThermo-ElectricThermo-Electric PerformanceThermo-Electric Properties
ISSN
1359-6454
Abstract
We simultaneously investigated the effects of nanostructure and crystal alignment on the thermoelectric performance of polycrystalline Bi 0.5Sb1.5Te3. An appropriate experimental procedure was devised for a sequential process of slip-casting under a 6 T magnetic field for c-axis alignment and the use of a spark plasma sinter machine for sintering. Flake-shaped powders with particles less than 36 μm in diameter stacked up with c-axis alignment under a 6 T rotating magnetic field, while the same powders with particles less than 5 μm in diameter showed a random orientation with no magnetic field. The c-axis-aligned material under the magnetic field showed an increase in hole mobility along the direction perpendicular to the c-axis that resulted in a 15% decrease in the electric resistivity, while the Seebeck coefficient and thermal conductivity remained unchanged; thus the figure of merit was improved by 15%. Theoretical evaluation of the electrical resistivity according to the c-axis alignment showed good agreement with the experimental results. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/5391
DOI
10.1016/j.actamat.2011.04.040
Publisher
Elsevier Ltd
Related Researcher
Files:
There are no files associated with this item.
Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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