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The effects of micr...
The effects of microstructure, Nb content and secondary Ruddlesden-Popper phase on thermoelectric properties in perovskite CaMn1-xNbxO3 (x=0-0.10) thin films
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- Ekström, Erik (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Le Febvrier, Arnaud (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Bourgeois, F. (author)
- Univ Technol Blois, France
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- Lundqvist, Björn (author)
- Linköpings universitet,Halvledarmaterial,Tekniska fakulteten
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- Palisaitis, Justinas (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Persson, Per O A (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Caballero-Calero, O. (author)
- CEI UAM, Spain
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- Martin-Gonzalez, M. S. (author)
- CEI UAM, Spain
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- Klarbring, Johan (author)
- Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten
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- Simak, Sergey (author)
- Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten
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- Eriksson, Fredrik (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Paul, Biplab (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Eklund, Per (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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(creator_code:org_t)
- 2020
- 2020
- English.
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In: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 10:13, s. 7918-7926
- Related links:
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https://liu.diva-por... (primary) (Raw object)
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https://pubs.rsc.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ekström, Erik
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Le Febvrier, Arn ...
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Bourgeois, F.
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Lundqvist, Björn
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Palisaitis, Just ...
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Persson, Per O A
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Caballero-Calero ...
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Martin-Gonzalez, ...
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Klarbring, Johan
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Simak, Sergey
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Eriksson, Fredri ...
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Paul, Biplab
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Eklund, Per
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
- Articles in the publication
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RSC Advances
- By the university
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Linköping University