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Fabrication and thermoelectric properties of c-axis-aligned Bi0.5Sb1.5Te3 with a high magnetic field
- Fabrication and thermoelectric properties of c-axis-aligned Bi0.5Sb1.5Te3 with a high magnetic field
- Kim, Dong Hwan; Kim, Cham; Je, Koo-Chul; Ha, Gook Hyun; Kim, Hoyoung
- DGIST Authors
- Kim, Dong Hwan; Kim, Cham; Kim, Hoyoung
- Issue Date
- Acta Materialia, 59(12), 4957-4963
- Article Type
- Alignment; Crystal Alignment; Crystal Orientation; Electric Conductivity; Electric Sparks; Electrical Resistivity; Experimental Procedure; High Magnetic Field; High Magnetic Fields; Hole Mobility; Magnetic Fields; Polycrystalline; Powders; Random Orientations; Rotating Magnetic Fields; Sequential Process; Sinter Machines; Slip-Casting; Spark Plasma; Spark Plasma Sintering; Theoretical Evaluation; Thermo-Electric; Thermo-Electric Performance; Thermo-Electric Properties
- 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.
- Elsevier Ltd
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- Magnet-Controlled Materials Research Group1. Journal Articles
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