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dc.contributor.authorSherwood, Toby
dc.contributor.authorBaker, Richard
dc.identifier.citationSherwood , T & Baker , R 2021 , ' Effects of strontium content on the microstructure and ionic conductivity of samarium-doped ceria ' , Solids , vol. 2 , no. 3 , pp. 293-313 .
dc.identifier.otherPURE: 275333967
dc.identifier.otherPURE UUID: 3c2de1ed-d43f-46eb-bc1f-5e2ec99d8eb4
dc.identifier.otherORCID: /0000-0002-3304-3280/work/98487756
dc.descriptionWe thank the School of Chemistry, University of St Andrews for a PhD studentship for TS.en
dc.description.abstractDue to its high oxygen ion conductivity at elevated temperatures, samarium-doped ceria (SDC) is a very promising material for application in solid state electrochemical devices and especially in the electrolytes of solid oxide fuel cells. Several prior studies have reported a further improvement in the ionic conductivity of SDC on doping with small amounts of strontium. It is suggested that strontium acts as a sintering aid—improving the microstructure of SDC—and as a scavenger of silicon impurities, decreasing its tendency to form resistive phases at grain boundaries. However, because of the range of preparation methods and the resulting differences in microstructure and silicon levels, some inconsistencies exist in the literature. Furthermore, the effect of strontium on the intrinsic (bulk) conductivity of SDC is not often discussed. To address these issues, a systematic, combined microstructural and conductivity study has been performed on a compositional series with a range of strontium contents, Ce0.8−xSm0.2SrxO2−δ (x = 0, 0.002, 0.005, 0.01, 0.02, 0.03, 0.04). A low temperature synthesis affording products with low silicon was employed. Total bulk and grain boundary conductivity data were obtained over a wide temperature range. Increasing strontium content caused a general decrease in total and intrinsic conductivity, but there was an improvement in grain boundary conductivity at the lowest strontium levels. These results were interpreted by reference to the microstructures using, among other parameters, the blocking, and normalised blocking, factors.
dc.rightsCopyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://
dc.subjectSolid Oxide Fuel Cellen
dc.subjectOxygen ion conductoren
dc.subjectImpedamce spectroscopyen
dc.subjectQD Chemistryen
dc.titleEffects of strontium content on the microstructure and ionic conductivity of samarium-doped ceriaen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Centre for Energy Ethicsen
dc.contributor.institutionUniversity of St Andrews.St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.description.statusPeer revieweden

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