Influence of Preparation Processing on the Transport Properties of Melt-Spun Sb2−xBixTe3+y

In this work, we present our attempt to improve the thermoelectric performance of melt-spun (MS) Sb 2− x Bi x Te 3+ y samples densified by spark plasma sintering (SPS) through two different methods: (1) alignment of the MS ribbons in the SPS die; (2) repetitive SPS sintering. A microstructural study...

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Bibliographic Details
Published in:Journal of electronic materials 2016-03, Vol.45 (3), p.1561-1569
Main Authors: Ohorodniichuk, V., Candolfi, C., Masschelein, Ph, Baranek, Ph, Dalicieux, P., Dauscher, A., Lenoir, B.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical Sciences
Chemistry and Materials Science
Condensed Matter
Electronics and Microelectronics
Engineering Sciences
Inorganic chemistry
Instrumentation
Materials
Materials Science
Optical and Electronic Materials
Physics
Solid State Physics
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Summary:In this work, we present our attempt to improve the thermoelectric performance of melt-spun (MS) Sb 2− x Bi x Te 3+ y samples densified by spark plasma sintering (SPS) through two different methods: (1) alignment of the MS ribbons in the SPS die; (2) repetitive SPS sintering. A microstructural study of the dense samples was performed by scanning electron microscopy supported by x-ray diffraction analyses. The thermoelectric and galvanomagnetic properties were measured in the direction perpendicular to the uniaxial pressing direction of SPS. Alignment of the ribbons gives rise to improved thermoelectric performances with an increase of up to 26% with respect to the reference sample, yielding a peak dimensionless figure of merit ZT value of 1.1 at 355 K. Yet, in contrast to recent studies, we observed a decrease in the thermoelectric efficiency of ∼10% in the Sb 1.5 Bi 0.5 Te 3.1 sample prepared by double-SPS compared to the sample densified with a single SPS process. Nevertheless, all MS samples possess improved thermal and electrical properties compared to the reference samples, proving the positive influence of this method.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-015-4114-9