Universität zu Köln

Guenes, Ekrem, Landschreiber, Bernadette, Homm, Gert, Wiegand, Christoph, Tomes, Petr ORCID: 0000-0001-5068-738X, Will, Christian, Elm, Matthias T. ORCID: 0000-0001-7014-5772, Paschen, Silke ORCID: 0000-0002-3796-0713, Klar, Peter J., Schlecht, Sabine and Wickleder, Mathias S. ORCID: 0000-0002-8864-4227 (2018). Structure and Thermoelectric Properties of Nanostructured Bi1-xSbx Alloys Synthesized by Mechanical Alloying. J. Electron. Mater., 47 (10). S. 6007 - 6016. NEW YORK: SPRINGER. ISSN 1543-186X

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Abstract

We report on the synthesis of Bi1-xSbx alloys and the investigation of the relationship between their structural and thermoelectric properties. In order to produce a compound that will work efficiently even above room temperature, Bi1-xSbx alloys were chosen, as they are known to be the best suited n-type thermoelectric materials in the low-temperature regime (200 K). Using a top-down method, we produced nanostructured Bi1-xSbx powders by ball-milling in the whole composition range of 0 < x < 1.0. Nanostructuring of Bi1-xSbx alloys increases the band gap and thus results in an enlargement of the semiconducting composition region (0 <= x <= 0.5) compared to its bulk counterpart (0.07 <= x <= 0.22). The enhancement of the band gap strongly affects the transport properties of the alloys, i.e. the electrical conductivity and the Seebeck coefficient. Moreover, nanostructuring reduces the thermal conductivity through the implementation of grain boundaries as phonon-scattering centers, leading to a significant enhancement of the thermoelectric properties. The highest figure-of-merit observed in this study is 0.25 which was found for Bi0.87Sb0.13 at 280 K.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Guenes, Ekrem UNSPECIFIED UNSPECIFIED UNSPECIFIED Landschreiber, Bernadette UNSPECIFIED UNSPECIFIED UNSPECIFIED Homm, Gert UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiegand, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Tomes, Petr UNSPECIFIED orcid.org/0000-0001-5068-738X UNSPECIFIED Will, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Elm, Matthias T. UNSPECIFIED orcid.org/0000-0001-7014-5772 UNSPECIFIED Paschen, Silke UNSPECIFIED orcid.org/0000-0002-3796-0713 UNSPECIFIED Klar, Peter J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlecht, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED Wickleder, Mathias S. UNSPECIFIED orcid.org/0000-0002-8864-4227 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-172257
DOI:	10.1007/s11664-018-6487-z
Journal or Publication Title:	J. Electron. Mater.
Volume:	47
Number:	10
Page Range:	S. 6007 - 6016
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1543-186X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BISMUTH-ANTIMONY ALLOYS; BI-SB ALLOYS; SEMIMETAL-SEMICONDUCTOR TRANSITION; THERMAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; THIN-FILMS; NANOWIRES; FIGURE; MERIT; NANOALLOYS Multiple languages Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17225