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Influence of power factor enhancement on the thermoelectric figure of merit in Mg2Si0.4Sn0.6 based materials

Dasgupta, Titas and Stiewe, Christian and de Boor, Johannes and Müller, Eckhard (2014) Influence of power factor enhancement on the thermoelectric figure of merit in Mg2Si0.4Sn0.6 based materials. Physica Status Solidi (A) - Applications and Materials Science, 211 (6), pp. 1250-1254. Wiley. DOI: 10.1002/pssa.201300196 ISSN 1862-6300

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Abstract

The influence of power factor enhancement on the superior thermoelectric (TE) performance of Mg2(Si,Sn) is studied based on a comparison with Mg2Si. Doped compounds with compositions of Mg2(Si0.4Sn0.6) are synthesized and the TE properties measured between room temperature and 773 K. Carrier concentration and hall mobilities at room temperature are measured on selected samples. Enhancement of the density-of-states effective mass and mobilities comparable to Mg2Si indicate band convergence in the solid solutions to be the cause of the power factor enhancement. Microstructural analysis shows the presence of secondary Si rich phases while the matrix corresponds to Mg2(Si0.3Sn0.7). A doped compound with this composition is synthesized and exhibits superior ZT values (compared to the Mg2(Si0.4Sn0.6) specimens) with a ZTmax ∼1.3 at 773 K.

Item URL in elib:https://elib.dlr.de/92542/
Document Type:Article
Title:Influence of power factor enhancement on the thermoelectric figure of merit in Mg2Si0.4Sn0.6 based materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dasgupta, TitasGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor, JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Date:21 May 2014
Journal or Publication Title:Physica Status Solidi (A) - Applications and Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:211
DOI :10.1002/pssa.201300196
Page Range:pp. 1250-1254
Publisher:Wiley
ISSN:1862-6300
Status:Published
Keywords:magnesium silicide; microstructure; thermoelectric; transport properties
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesystem III (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:01 Dec 2014 10:37
Last Modified:06 Sep 2019 15:29

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