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dc.contributor.authorHesse, Fabian
dc.contributor.authorda Silva, Ivan
dc.contributor.authorBos, Jan-Willem Gezienes
dc.identifier.citationHesse , F , da Silva , I & Bos , J-W G 2024 , ' Oxygen migration pathways in layered LnBaCo 2 O 6-δ  (Ln = La-Y) perovskites ' , JACS Au , vol. 4 , no. 4 , pp. 1538-1549 .
dc.identifier.otherORCID: /0000-0003-3947-2024/work/157140752
dc.descriptionFunding: Engineering and Physical Sciences Research Council - EP/L016419/1.en
dc.description.abstractLayered LnBaCo2O6-δ perovskites are important mixed ionic-electronic conductors, exhibiting outstanding catalytic properties for the oxygen evolution/reduction reaction. These phases exhibit considerable structural complexity, in particular, near room temperature, where a number of oxygen vacancy ordered superstructures are found. This study uses bond valence site energy calculations to demonstrate the key underlying structural features that favor facile ionic migration. BVSE calculations show that the 1D vacancy ordering for Ln = Sm–Tb could be beneficial at low temperatures as new pathways with reduced barriers emerge. By contrast, the 2D vacancy ordering for Ln = Dy and Y is not beneficial for ionic transport with the basic layered parent material having lower migration barriers. Overall, the key criterion for low migration barriers is an expanded ab plane, supported by Ba, coupled to a small Ln size. Hence, Ln = Y should be the best composition, but this is stymied by the low temperature 2D vacancy ordering and moderate temperature stability. The evolution of the oxygen cycling capability of these materials is also reported.
dc.relation.ispartofJACS Auen
dc.subjectBVSE calculationsen
dc.subjectOxygen vacancy orderingen
dc.subjectCobalt oxide perovskitesen
dc.subjectLayered double perovskiteen
dc.subjectMixed ionic electronic conductoren
dc.subjectNeutron powder diffractionen
dc.subjectQD Chemistryen
dc.titleOxygen migration pathways in layered LnBaCo2O6-δ (Ln = La-Y) perovskitesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.description.statusPeer revieweden

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