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The Influence of Synthesis Procedure on the Microstructure and Thermoelectric Properties of p-Type Skutterudite Ce0.6Fe2Co2Sb12

Sesselmann, Andreas J. and Skomedal, Gunstein and Middleton, Peter Hugh and Müller, Eckhard (2015) The Influence of Synthesis Procedure on the Microstructure and Thermoelectric Properties of p-Type Skutterudite Ce0.6Fe2Co2Sb12. Journal of Electronic Materials. Springer. DOI: 10.1007/s11664-015-4046-4 ISSN 0361-5235

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Abstract

We have investigated p-type skutterudite samples with the nominal composition Ce0.6Co2Fe2Sb12 synthesized from elementary constituents by gas atomization and conventional melting, and also those synthesized from ternary and binary phases such as FexCo1�xSb2 and CeSb2, respectively, which were mixed and subsequently ball-milled. We conducted measurements of the temperature-dependent transport properties (Seebeck coefficient, thermal/electrical conductivity) and carried out scanning electron microscope analysis, electron probe micro-analysis and powder x-ray diffraction to obtain information about microstructure and elementary distribution of the phases. We show that the presented synthesis methods each possess particular strengths but ultimately, however, lead to different final compositions of the skutterudite phase and secondary phases, which significantly influence the thermoelectric properties of the material. Material prepared using an educt method gave the best thermoelectric properties with a peak ZT of 0.7. Furthermore, we show that even an apparent homogeneous skutterudite area within the material exhibits varying stoichiometry in each grain even though they conform to the solubility range of cerium in this p-type skutterudite. Moreover, we show that marcasite is preferred as an educt over the arsenopyrite phase and discuss the formation of the p-type skutterudite phase with these synthesis techniques.

Item URL in elib:https://elib.dlr.de/100081/
Document Type:Article
Title:The Influence of Synthesis Procedure on the Microstructure and Thermoelectric Properties of p-Type Skutterudite Ce0.6Fe2Co2Sb12
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sesselmann, Andreas J.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Skomedal, GunsteinFaculty of Engineering and Science, University of Agder, 4879 Grimstad,UNSPECIFIED
Middleton, Peter HughFaculty of Engineering and Science, University of Agder, 4879 Grimstad,UNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany and Justus Liebig University Giessen, Institute of Inorganic and Analytical Chemistry, 35392 Giessen, GermanyUNSPECIFIED
Date:30 September 2015
Journal or Publication Title:Journal of Electronic Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s11664-015-4046-4
Publisher:Springer
ISSN:0361-5235
Status:Published
Keywords:p-Type skutterudite, synthesis, microstructure, peritectic reaction, transformation rate
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:27 Nov 2015 10:23
Last Modified:10 Jan 2019 15:09

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