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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 ...

  • 2020
  • Royal Society of Chemistry,2020
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:liu-165095
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-165095URI
  • https://doi.org/10.1039/c9ra10007eDOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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]
  • 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)
  • Bourgeois, F.Univ Technol Blois, France (author)
  • Lundqvist, BjörnLinköpings universitet,Halvledarmaterial,Tekniska fakulteten(Swepub:liu)bjolu18 (author)
  • Palisaitis, JustinasLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)juspa01 (author)
  • Persson, Per O ALinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)perpe25 (author)
  • Caballero-Calero, O.CEI UAM, Spain (author)
  • Martin-Gonzalez, M. S.CEI UAM, Spain (author)
  • Klarbring, JohanLinköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)johkl85 (author)
  • Simak, SergeyLinköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)sersi78 (author)
  • Eriksson, FredrikLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)freer90 (author)
  • Paul, BiplabLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)bippa36 (author)
  • Eklund, PerLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)perek02 (author)
  • Linköpings universitetTunnfilmsfysik (creator_code:org_t)

Related titles

  • In:RSC Advances: Royal Society of Chemistry10:13, s. 7918-79262046-2069

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