Article (Scientific journals)
Microstructures and nanostructures in long-term annealed AgPb18SbTe20 (LAST-18) compounds and their influence on the thermoelectric properties
Dadda, Jayaram; Mueller, Eckhard; Perlt, Susanne et al.
2011In Journal of Materials Research, 26 (15), p. 1800-1812
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Abstract :
[en] This article reports on the role of annealing on the development of microstructure and its concomitant effects on the thermoelectric 18 lead-antimony-silver- tellurium, LAST-18) compounds. The annealing temperature was varied by applying a gradient annealing method, where a 40-mm-long sample rod was heat treated in an axial temperature gradient spanning between 200 and 600 degrees C for 7 days. Transmission electron microscopy investigations revealed Ag2Te nanoparticles at a size of 20-250 nm in the matrix. A remarkable reduction in the thermal conductivity to as low as 0.8W/mK was also recorded. The low thermal conductivity coupled with a large Seebeck coefficient of similar to 320 mu V/K led to high ZT of about 1.05 at 425 degrees C for the sample annealed at 505 degrees C. These results also demonstrate that samples annealed above 450 degrees C for long term are more thermally stable than those treated at lower temperatures.
Disciplines :
Physics
Author, co-author :
Dadda, Jayaram;  Dadda, J (Reprint Author), German Aerosp Ctr DLR, Inst Mat Res, D-51170 Cologne, Germany.. Dadda, Jayaram
Mueller, Eckhard;  Mueller, Eckhard, German Aerosp Ctr DLR, Inst Mat Res, D-51170 Cologne, Germany. Perlt, Susanne
Perlt, Susanne;  Hoeche, Thomas, Leibniz Inst Surface Modificat IOM, D-04318 Leipzig, Germany. Pereira, Paula Bauer
Thomas, Hoeche;  Hermann, Raphael P., Forschungszentrum Julich, IFF, JNCS, D-52425 Julich, Germany. Pereira, Paula Bauer
Pereira, Paula Bauer;  Hermann, Raphael P., JARA FIT, D-52425 Julich, Germany. Pereira, Paula Bauer
Hermann, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Microstructures and nanostructures in long-term annealed AgPb18SbTe20 (LAST-18) compounds and their influence on the thermoelectric properties
Publication date :
2011
Journal title :
Journal of Materials Research
ISSN :
0884-2914
eISSN :
2044-5326
Publisher :
CAMBRIDGE UNIV PRESS, NEW YORK, United States - New York
Volume :
26
Issue :
15
Pages :
1800-1812
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Article
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since 14 December 2012

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