elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions

Mallik, Ramesh-Chandra und Stiewe, Christian und Karpinski, Gabriele und Haßdorf, Ralf und Müller, Eckhard (2009) Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions. Journal of Electronic Materials, 38 (7), Seiten 1337-1343. DOI: 10.1007/s11664-009-0663-0. ISSN 1543-186X .

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

The properties of Co4Sb12 with various In additions were studied. X-ray diffraction revealed the presence of the pure δ-phase of In0.16Co4Sb12, whereas impurity phases (γ-CoSb2 and InSb) appeared for x = 0.25, 0.40, 0.80, and 1.20. The homogeneity and morphology of the samples were observed by Seebeck microprobe and scanning electron microscopy, respectively. All the quenched ingots from which the studied samples were cut were inhomogeneous in the axial direction. The temperature dependence of the Seebeck coefficient (S), electrical conductivity (σ), and thermal conductivity (κ) was measured from room temperature up to 673 K. The Seebeck coefficient of all In-added Co4Sb12 materials was negative. When the filler concentration increases, the Seebeck coefficient decreases. The samples with In additions above the filling limit (x = 0.22) show an even lower Seebeck coefficient due to the formation of secondary phases: InSb and CoSb2. The temperature variation of the electrical conductivity is semiconductor-like. The thermal conductivity of all the samples decreases with temperature. The central region of the In0.4Co4Sb12 ingot shows the lowest thermal conductivity, probably due to the combined effect of (a) rattling due to maximum filling and (b) the presence of a small amount of fine-dispersed secondary phases at the grain boundaries. Thus, regardless of the non-single-phase morphology, a promising ZT (S 2 σT/κ) value of 0.96 at 673 K has been obtained with an In addition above the filling limit.

Dokumentart:Zeitschriftenbeitrag
Titel:Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Mallik, Ramesh-ChandraDepartment of Physics, Indian Institute of Science, Bangalore, 560 012, India
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Karpinski, GabrieleGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Haßdorf, RalfGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Datum:27 Januar 2009
Erschienen in:Journal of Electronic Materials
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:38
DOI :10.1007/s11664-009-0663-0
Seitenbereich:Seiten 1337-1343
ISSN:1543-186X
Status:veröffentlicht
Stichwörter:Skutterudite - thermoelectric - electrical conductivity - thermal conductivity - Seebeck coefficient
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - Fahrzeugenergiesysteme (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Thermoelektrische Materialien und Systeme
Hinterlegt von: Dr. Knud Zabrocki
Hinterlegt am:24 Nov 2009 16:44
Letzte Änderung:20 Mär 2013 19:42

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.