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The effects of micr...
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Ekström, ErikLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
(author)
The effects of microstructure, Nb content and secondary Ruddlesden-Popper phase on thermoelectric properties in perovskite CaMn1-xNbxO3 (x=0-0.10) thin films
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020
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Royal Society of Chemistry,2020
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:liu-165095
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-165095URI
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https://doi.org/10.1039/c9ra10007eDOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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Funding Agencies|Swedish Foundation for Strategic Research (SSF) through the Future Research Leaders 5 program; Swedish Research Council (VR)Swedish Research Council [2016-03365, 2014-4750]; Knut and Alice Wallenberg Foundation through the Wallenberg Academy Fellows program; Electron Microscopy Laboratory at Linkoping University; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; Swedish Energy AgencySwedish Energy Agency [46519-1]; Spanish MinistrySpanish Government [MAT2017-86450-C4-3-R]
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CaMn1-xNbxO3 (x = 0, 0.5, 0.6, 0.7 and 0.10) thin films have been grown by a two-step sputtering/annealing method. First, rock-salt-structured (Ca,Mn1-x,Nb-x)O thin films were deposited on 11 & x304;00 sapphire using reactive RF magnetron co-sputtering from elemental targets of Ca, Mn and Nb. The CaMn1-xNbxO3 films were then obtained by thermally induced phase transformation from rock-salt-structured (Ca,Mn1-xNbx)O to orthorhombic during post-deposition annealing at 700 degrees C for 3 h in oxygen flow. The X-ray diffraction patterns of pure CaMnO3 showed mixed orientation, while Nb-containing films were epitaxially grown in [101] out of-plane-direction. Scanning transmission electron microscopy showed a Ruddlesden-Popper (R-P) secondary phase in the films, which results in reduction of the electrical and thermal conductivity of CaMn1-xNbxO3. The electrical resistivity and Seebeck coefficient of the pure CaMnO3 film were measured to 2.7 omega cm and -270 mu V K-1 at room temperature, respectively. The electrical resistivity and Seebeck coefficient were reduced by alloying with Nb and was measured to 0.09 omega cm and -145 mu V K-1 for x = 0.05. Yielding a power factor of 21.5 mu W K-2 m(-1) near room temperature, nearly eight times higher than for pure CaMnO3 (2.8 mu W K-2 m(-1)). The power factors for alloyed samples are low compared to other studies on phase-pure material. This is due to high electrical resistivity originating from the secondary R-P phase. The thermal conductivity of the CaMn1-xNbxO3 films is low for all samples and is the lowest for x = 0.07 and 0.10, determined to 1.6 W m(-1) K-1. The low thermal conductivity is attributed to grain boundary scattering and the secondary R-P phase.
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Le Febvrier, ArnaudLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)arnle40
(author)
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Bourgeois, F.Univ Technol Blois, France
(author)
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Lundqvist, BjörnLinköpings universitet,Halvledarmaterial,Tekniska fakulteten(Swepub:liu)bjolu18
(author)
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Palisaitis, JustinasLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)juspa01
(author)
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Persson, Per O ALinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)perpe25
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Caballero-Calero, O.CEI UAM, Spain
(author)
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Martin-Gonzalez, M. S.CEI UAM, Spain
(author)
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Klarbring, JohanLinköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)johkl85
(author)
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Simak, SergeyLinköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)sersi78
(author)
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Eriksson, FredrikLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)freer90
(author)
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Paul, BiplabLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)bippa36
(author)
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Eklund, PerLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)perek02
(author)
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Linköpings universitetTunnfilmsfysik
(creator_code:org_t)
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In:RSC Advances: Royal Society of Chemistry10:13, s. 7918-79262046-2069
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