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Lowering the thermal conductivity of Sr(Ti0.8Nb0.2)O3 by SrO and CaO doping: microstructure and thermoelectric properties

Jerič, Marja and de Boor, Johannes and Zavašnik, Janez and Čeh, Miran (2016) Lowering the thermal conductivity of Sr(Ti0.8Nb0.2)O3 by SrO and CaO doping: microstructure and thermoelectric properties. Journal of Materials Science, 51 (16), pp. 7660-7668. Springer. ISSN 0022-2461

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Official URL: http://dx.doi.org/10.1007/s10853-016-0048-8

Abstract

Excess SrO and CaO were added to the Sr(Ti0.8Nb0.2)O3 thermoelectric material, which was structurally compensated by the formation of Ruddlesden–Popper-type planar faults with the compositions SrO and/or (Sr, Ca)O. Both types of doping significantly changed the original isotropic Sr(Ti0.8Nb0.2)O3 microstructure and resulted in the formation of lamellar Ruddlesden–Popper-type phases within the Sr(Ti0.8Nb0.2)O3 grains. Three-dimensional networks of single Ruddlesden–Popper-type faults were also observed in the Sr(Ti0.8Nb0.2)O3 for both types of doping. The combination of both structural features significantly lowered the thermal conductivity in comparison with Sr(Ti0.8Nb0.2)O3 due to the enhanced phonon scattering observed at the planar faults, which proves that introducing such defects is a promising method for lowering the thermal conductivity of the Sr(Ti0.8Nb0.2)O3 thermoelectric material. The highest figure of merit (ZT = 0.08) was achieved with CaO doping, since the significantly reduced thermal conductivity was accompanied by an increased power factor.

Item URL in elib:https://elib.dlr.de/108681/
Document Type:Article
Title:Lowering the thermal conductivity of Sr(Ti0.8Nb0.2)O3 by SrO and CaO doping: microstructure and thermoelectric properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jerič, MarjaDepartment for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia and Jožef Stefan Postgraduate School, Ljubljana, SloveniaUNSPECIFIED
de Boor, JohannesGerman aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Zavašnik, JanezCenter for Electron Microscopy and Analysis, Ljubljana, SloveniaUNSPECIFIED
Čeh, MiranDepartment for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia and Center for Electron Microscopy and Analysis, Ljubljana, SloveniaUNSPECIFIED
Date:20 May 2016
Journal or Publication Title:Journal of Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:51
Page Range:pp. 7660-7668
Publisher:Springer
ISSN:0022-2461
Status:Published
Keywords:Thermoelectric materials, microstructure, Sr(Ti0.8Nb0.2)O3
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:01 Dec 2016 09:59
Last Modified:06 Sep 2019 15:28

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