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dc.contributor.authorGunnæs, Anette Eleonora
dc.contributor.authorTofan, Raluca
dc.contributor.authorBerland, Kristian
dc.contributor.authorGorantla, Sandeep Madhukar
dc.contributor.authorStoraas, Thomas Aarflot
dc.contributor.authorDesissa, Temesgen Debelo
dc.contributor.authorSchrade, Matthias
dc.contributor.authorPersson, Clas
dc.contributor.authorEinarsrud, Mari-Ann
dc.contributor.authorWiik, Kjell
dc.contributor.authorNorby, Truls Eivind
dc.contributor.authorKanas, Nikola
dc.identifier.citationRSC Advances. 2020, 10 (9), 5026-5031.en_US
dc.description.abstractAn all-oxide thermoelectric generator for high-temperature operation depends on a low electrical resistance of the direct p–n junction. Ca3Co4−xO9+δ and CaMnO3−δ exhibit p-type and n-type electronic conductivity, respectively, and the interface between these compounds is the material system investigated here. The effect of heat treatment (at 900 °C for 10 h in air) on the phase and element distribution within this p–n junction was characterized using advanced transmission electron microscopy combined with X-ray diffraction. The heat treatment resulted in counter diffusion of Ca, Mn and Co cations across the junction, and subsequent formation of a Ca3Co1+yMn1−yO6 interlayer, in addition to precipitation of Co-oxide, and accompanying diffusion and redistribution of Ca across the junction. The Co/Mn ratio in Ca3Co1+yMn1−yO6 varies and is close to 1 (y = 0) at the Ca3Co1+yMn1−yO6–CaMnO3−δ boundary. The existence of a wide homogeneity range of 0 ≤ y ≤ 1 for Ca3Co1+yMn1−yO6 is corroborated with density functional theory (DFT) calculations showing a small negative mixing energy in the whole range.en_US
dc.publisherRoyal Society of Chemistryen_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.titleChemical stability of Ca3Co4−xO9+δ/CaMnO3−δ p–n junction for oxide-based thermoelectric generatorsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.source.journalRSC Advancesen_US
dc.relation.projectNorges forskningsråd: 228854en_US
dc.description.localcodeOpen Access Article. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.en_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse-Ikkekommersiell 4.0 Internasjonal