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Oxide Ion and Proton Conductivity in a Family of Highly Oxygen-Deficient Perovskite Derivatives

Fuller, Chloe A.; Blom, Douglas A.; Vogt, Thomas; Radosavljevic Evans, Ivana; Evans, John S.O.

Oxide Ion and Proton Conductivity in a Family of Highly Oxygen-Deficient Perovskite Derivatives Thumbnail


Authors

Chloe A. Fuller

Douglas A. Blom

Thomas Vogt



Abstract

Functional oxides showing high ionic conductivity have many important technological applications. We report oxide ion and proton conductivity in a family of perovskite-related compounds of the general formula A3OhTd2O7.5, where Oh is an octahedrally coordinated metal ion and Td is a tetrahedrally coordinated metal ion. The high tetrahedral content in these ABO2.5 compositions relative to that in the perovskite ABO3 or brownmillerite A2B2O5 structures leads to tetrahedra with only three of their four vertices connected in the polyhedral framework, imparting a potential low-energy mechanism for O2– migration. The low- and high-temperature average and local structures of Ba3YGa2O7 (P2/c, a = 7.94820(5) Å, b = 5.96986(4) Å, c = 18.4641(1) Å, and β = 91.2927(5) ° at 22 °C) were determined by Rietveld and neutron pair distribution function (PDF) analysis, and a phase transition to a high-temperature P1121/a structure (a = 12.0602(1) Å, b = 9.8282(2) Å, c = 8.04982(6) Å, and γ = 107.844(3)° at 1000 °C) involving the migration of O2– ions was identified. Ionic conductivities of Ba3YGa2O7.5 and compositions substituted to introduce additional oxide vacancies and interstitials are reported. Most phases show proton conductivity at lower temperatures and oxide ion conductivity at high temperatures, with Ba3YGa2O7.5 retaining proton conductivity at high temperatures. Ba2.9La0.1YGa2O7.55 and Ba3YGa1.9Ti0.1O7.55 appear to be dominant oxide ion conductors, with conductivities an order of magnitude higher than that of the parent compound.

Citation

Fuller, C. A., Blom, D. A., Vogt, T., Radosavljevic Evans, I., & Evans, J. S. (2022). Oxide Ion and Proton Conductivity in a Family of Highly Oxygen-Deficient Perovskite Derivatives. Journal of the American Chemical Society, 144(1), 615-624. https://doi.org/10.1021/jacs.1c11966

Journal Article Type Article
Acceptance Date Nov 21, 2021
Online Publication Date Dec 30, 2021
Publication Date Jan 12, 2022
Deposit Date Mar 14, 2022
Publicly Available Date Dec 30, 2022
Journal Journal of the American Chemical Society
Print ISSN 0002-7863
Electronic ISSN 1520-5126
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 144
Issue 1
Pages 615-624
DOI https://doi.org/10.1021/jacs.1c11966
Public URL https://durham-repository.worktribe.com/output/1215522

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Accepted Journal Article (Supplementary Information) (2.4 Mb)
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Copyright Statement
Supplementary Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/jacs.1c11966





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