Oxide ion and proton conductivity in highly oxygen-deficient cubic perovskite SrSc0.3Zn0.2Ga0.5O2.4

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dc.contributor.authorFuller, CAen_AU
dc.contributor.authorBerrod, Qen_AU
dc.contributor.authorFrick, Ben_AU
dc.contributor.authorJohnson, MRen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorEvans, JSOen_AU
dc.contributor.authorEvans, IRen_AU
dc.date.accessioned2020-09-29T02:20:45Zen_AU
dc.date.available2020-09-29T02:20:45Zen_AU
dc.date.issued2020-04-27en_AU
dc.date.statistics2020-09-25en_AU
dc.description.abstractA series of Zn-substituted compounds, Sr2Sc1–xZnxGaO5–0.5x, based on the brownmillerite-type oxide ion conductor Sr2ScGaO5 have been synthesized, and a single-phase region has been identified at 0.4 ≤ x < 0.6. The structure and dynamics of Sr2Sc0.6Zn0.4GaO4.8 were investigated by X-ray and neutron diffraction, neutron total scattering and pair distribution function (PDF) analysis, impedance spectroscopy, and neutron spectroscopy. The material was found to be a highly disordered cubic perovskite with a remarkable level of oxygen deficiency across a large temperature range. These structural properties lead to an increase of oxide ion conductivity of about two orders of magnitude relative to the parent Sr2ScGaO5. The presence of proton conductivity and some water uptake was suggested by the impedance data and corroborated by thermogravimetric analysis (TGA), solid state nuclear magnetic resonance (NMR), variable temperature X-ray diffraction, and neutron spectroscopy. Both proton and oxide ion conductivity produced a measurable quasi-elastic neutron scattering (QENS) signal, and the onset of each dynamic process could be observed by monitoring the temperature dependence of the elastic and inelastic scattering intensities measured in fixed window scans. Neutron total scattering and PDF studies revealed a local structure that is markedly different from the perovskite average structure, and we propose that Sr2Sc0.6Zn0.4GaO4.8 contains a rare one-coordinate or terminal oxygen site. © 2020 American Chemical Societyen_AU
dc.identifier.citationFuller, C. A., Berrod, Q., Frick, B., Johnson, M. R., Avdeev, M., Evans, J. S. O., & Evans, I. R. (2020). Oxide ion and proton conductivity in highly oxygen-deficient cubic perovskite SrSc0.3Zn0.2Ga0.5O2.4. Chemistry of Materials, 32(10), 4347-4357. doi:10.1021/acs.chemmater.0c01378en_AU
dc.identifier.issn1520-5002en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleChemistry of Materialsen_AU
dc.identifier.pagination4347-4357en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.chemmater.0c01378en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9830en_AU
dc.identifier.volume32en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectPair spectrometersen_AU
dc.subjectPerovskiteen_AU
dc.subjectOxygenen_AU
dc.subjectNuclear magnetic resonanceen_AU
dc.subjectStructure factorsen_AU
dc.titleOxide ion and proton conductivity in highly oxygen-deficient cubic perovskite SrSc0.3Zn0.2Ga0.5O2.4en_AU
dc.typeJournal Articleen_AU
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