elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Structure, Phase Composition and Thermoelectric Properties of YbxCo4Sb12 and Their Dependence on Synthesis Method

Ryll, Britta and Schmitz, Andreas and de Boor, Johannes and Franz, Alexandra and Whitfield, Pamela S. and Reehuis, Manfred and Hoser, Andreas and Müller, Eckhard and Habicht, Klaus and Fritsch, Katharina (2017) Structure, Phase Composition and Thermoelectric Properties of YbxCo4Sb12 and Their Dependence on Synthesis Method. ACS Applied Energy Materials. American Chemical Society (ACS). DOI: 10.1021/acsaem.7b00015 ISSN 2574-0962

Full text not available from this repository.

Abstract

We present a combined microscopic and macroscopic study of YbxCo4Sb12 skutterudites for a range of nominal filling fractions, 0.15 < x < 0.75. The samples were synthesized using two different methods - a melt-quench-annealing route in evacuated quartz ampoules and a non-equilibrium ball mill route - for which we directly compare the crystal structure and phase composition as well as the thermoelectric properties. Rietveld refinements of high-quality neutron powder diffraction data reveal an about 30-40% smaller Yb occupancy on the crystallographic 2a site than nominally expected for both synthesis routes. We observe a maximum filling fraction of at least 0.439(7) for a sample synthesized by the ball mill routine, exceeding theoretical predictions of the filling fraction limit of 0.2-0.3. A single secondary phase of CoSb2 is observed in ball-mill-synthesized samples, while two secondary phases, CoSb2 and YbSb2, are detected for samples prepared by the ampoule route. A detrimental influence of the secondary phases on the thermoelectric properties is observed for secondary phase fractions larger than 8 wt% regardless of the kind of secondary phase. The largest figure of merit of all samples with a ZT~1.0 at 723K is observed for the sample with a refined Yb content of x2a = 0.159(3), synthesized by the ampoule route.

Item URL in elib:https://elib.dlr.de/116970/
Document Type:Article
Title:Structure, Phase Composition and Thermoelectric Properties of YbxCo4Sb12 and Their Dependence on Synthesis Method
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ryll, BrittaHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, GermanyUNSPECIFIED
Schmitz, AndreasGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Franz, AlexandraHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, GermanyUNSPECIFIED
Whitfield, Pamela S.Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Excelsus Structural Solutions PARK InnovAARE, 5234 Villigen, SwitzerlandUNSPECIFIED
Reehuis, ManfredHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, GermanyUNSPECIFIED
Hoser, AndreasHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, GermanyUNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany and Justus Liebig University Giessen, Institute of Inorganic and Analytical Chemistry, 35392 Giessen, GermanyUNSPECIFIED
Habicht, KlausHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, Germany and Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straÿe 24-25, 14476 Potsdam, GermanyUNSPECIFIED
Fritsch, KatharinaHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, GermanyUNSPECIFIED
Date:11 December 2017
Journal or Publication Title:ACS Applied Energy Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1021/acsaem.7b00015
Publisher:American Chemical Society (ACS)
ISSN:2574-0962
Status:Published
Keywords:Thermoelectric materials, Skutterudite, Melt-quench-anneal, Ball mill, Neutron powder diff�raction, Thermoelectric properties, �Figure of merit
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 - NGC-Antriebsstrang (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:12 Dec 2017 16:51
Last Modified:06 Mar 2019 12:28

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.