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dc.contributor.authorWind, Julia
dc.contributor.authorSharma, Neeraj
dc.contributor.authorYaremchenko, Aleksey A
dc.contributor.authorKharton, Vladislav V
dc.contributor.authorBlom, Douglas A
dc.contributor.authorVogt, Thomas
dc.contributor.authorLing, Chris D
dc.date.accessioned2019-11-21T06:06:07Z
dc.date.available2019-11-21T06:06:07Z
dc.date.issued2018
dc.identifier.citationJ Wind, N Sharma, AA Yaremchenko, VV Kharton, DA Blom, T Vogt and CD Ling, Chemistry of Materials 30, 3387–3395 (2018)en_AU
dc.identifier.urihttps://hdl.handle.net/2123/21398
dc.description.abstractStarting from a previously published stoichiometric model for the commensurate Type III phase in the (1–x)Bi2O3∙xNb2O5 system, Bi94Nb32O221 (x = 0.254), we have developed a crystal-chemical model of this phase across its solid-solution range 0.20 ≤ x ≤ 0.26. After using annular dark-field scanning transmission electron microscopy to identify the metal sites that support non-stoichiometry, we show that the maximum possible range of that non-stoichiometry is 0.198 ≤ x ≤ 0.262, perfectly consistent with the experimental result. Inter-site cation defects on these sites provide some local coordinative flexibility with respect to the surrounding oxygen sublattice, but not enough to create continuous fluorite-like channels like those found in the high-temperature incommensurate Type II phase. This explains the reduced oxide-ionic conductivity of Type III compared to Type II at all temperatures and compositions, regardless of which phase is thermody-namically stable under those conditions. The solid-solution model shows that oxygen disorder and vacancies are both re-duced as x increases, which also explains why Type III becomes relatively more stable, and why oxide ionic conductivity decreases, as x increases.en_AU
dc.language.isoen_AUen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.relationARC DP150102863en_AU
dc.rightsThis document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Chemistry of Materials, copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.chemmater.8b00846en_AU
dc.titleLocal structure adaptations and oxide ionic conductivity in the Type III stability region of (1–x)Bi2O3∙xNb2O5en_AU
dc.typeArticleen_AU
dc.subject.asrcFoR::030206 - Solid State Chemistryen_AU
dc.identifier.doihttps://doi.org/10.1021/acs.chemmater.8b00846
dc.type.pubtypePost-printen_AU


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