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Thermoelectric and transport properties of nanostructured Bi2Te3 by spark plasma sintering

Published online by Cambridge University Press:  09 February 2011

Zhihui Zhang ,
Peter A. Sharma ,
Enrique J. Lavernia  and
Nancy Yang
Zhihui Zhang*
Affiliation:
University of California, Davis, Department of Chemical Engineering and Materials Science, Davis, California 95616
Peter A. Sharma
Affiliation:
Sandia National Laboratories, Energy Nanomaterials Sciences, Livermore, California 94551-0969
Enrique J. Lavernia
Affiliation:
University of California, Davis, Department of Chemical Engineering and Materials Science, Davis, California 95616
Nancy Yang
Affiliation:
Sandia National Laboratories, Energy Nanomaterials Sciences, Livermore, California 94551-0969
*
a)Address all correspondence to this author. e-mail: zhizhang@ucdavis.edu
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Abstract

N-type Bi2Te3 alloys with different microstructural length scales were prepared by mechanical milling and spark plasma sintering (SPS). The electrical resistivity, thermal conductivity, Seebeck coefficient, carrier concentration, and Hall mobility along and perpendicular to the loading direction were determined and characterized. The SPS sintered bulk disks using nanostructured powder contain high nanoporosity and weak (00l) texture along the loading axis, in contrast to those obtained with coarse powder. The influence of nanoporosity and texture on the thermoelectric and transport properties in the n-type Bi2Te3 alloys is discussed in light of the microstructural characteristics at different length scales.

Keywords

ThermoelectricNanostructurePorosity
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 3 , 14 February 2011 , pp. 475 - 484
Copyright
Copyright © Materials Research Society 2011

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