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dc.contributor.authorDesissa, Temesgen D.
dc.contributor.authorKanas, Nikola
dc.contributor.authorSingh, Sathya Prakash
dc.contributor.authorWiik, Kjell
dc.contributor.authorEinarsrud, Mari-Ann
dc.contributor.authorNorby, Truls Eivind
dc.date.accessioned2018-03-02T14:32:24Z
dc.date.available2018-03-02T14:32:24Z
dc.date.created2018-01-04T10:59:25Z
dc.date.issued2018
dc.identifier.citationPhysical Chemistry, Chemical Physics - PCCP. 2018, 4.nb_NO
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/11250/2488394
dc.description.abstractDiffusivity on the A- and B-site of polycrystalline perovskite CaMnO3-δ with Ca deficiency and spinel CaMn2O4 (marokite) as a secondary phase was studied using chemical tracers and secondary ion mass spectrometry (SIMS) complemented by electron probe microanalysis (EPMA). Thin films containing Sr and Co chemical tracers were deposited on the polished surface of the polycrystalline composite sample followed by annealing at 800 – 1200 °C for 96 h. Diffusion profiles for each tracer were determined with SIMS, followed by calculation of diffusion coefficients by fitting to appropriate models. The Sr tracer showed mainly lattice diffusion, with an activation energy of 210±30 kJ/mol, whereas the Co tracer showed a combination of lattice and enhanced grain-boundary diffusion, with activation energies of 270±30 kJ/mol and 380±40 kJ/mol, respectively. The diffusivities may be used to predict interdiffusion and lifetime of junctions between n-type CaMnO3-δ or CaMnO3-δ/CaMn2O4 composites and metallization interlayers or p-type leg materials in oxide thermoelectrics. In particular, the relatively high effective diffusivity of Co in polycrystalline CaMnO3 δ may play a role in the reported fast formation of the secondary phase (Ca3Co2-yMnyO6) between p-type Ca3Co3.92O9+δ and n-type CaMnO3-δ in a direct p-n thermoelectric junction.nb_NO
dc.language.isoengnb_NO
dc.publisherRoyal Society of Chemistrynb_NO
dc.titleChemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3-δ with CaMn2O4 precipitatesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.volume4nb_NO
dc.source.journalPhysical Chemistry, Chemical Physics - PCCPnb_NO
dc.identifier.doi10.1039/C7CP07471A
dc.identifier.cristin1535589
dc.relation.projectNorges forskningsråd: 228854nb_NO
dc.description.localcode© Royal Society of Chemistry 2018. This is the authors' accepted and reviewed manuscript of the article, locked until 3 January 2019 due to copyright restrictions.nb_NO
cristin.unitcode194,66,35,0
cristin.unitnameInstitutt for materialteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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