Factors controlling the oxide ion conductivity of fluorite and perovskite structured oxides

Mogens Bjerg Mogensen, D. Lybye, N. Bonanos, P.V. Hendriksen, F.W. Poulsen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Many metal oxides of fluorite and perovskite related structures are oxide ion conductors, which have practical applications in devices such as oxygen sensors, solid oxide fuel cells (SOFC) and electrolysers. Several structural and thermodynamic parameters such as (1) critical radius of the pathway for the oxide ion movement, (2) free lattice volume, and (3) average metal-oxide bond energy have been proposed as predictors of high oxide ion conductivity. We discuss how these parameters all depend on ionic radii, and therefore, some of these may be redundant. Furthermore, we explore the interrelations among such parameters for fluorite and perovskite oxides by considering their sensitivities to the individual ionic radii. Based on experimental data available in the literature, it is argued that lattice distortion (lattice stress and deviation from cubic symmetry) due to ion radii mismatch determines the ionic conductivity to a very large extent, and that lattice distortion is of much greater importance than many other proposed parameters. In case of the perovskites, the charge of the B-site ion is also of major importance. (C) 2004 Published by Elsevier B.V.
    Original languageEnglish
    JournalSolid State Ionics
    Volume174
    Issue number1-4
    Pages (from-to)279-286
    ISSN0167-2738
    DOIs
    Publication statusPublished - 2004
    EventDokiya memorial international symposium on solid oxide fuel cells - Tokyo (JP), 24-25 Jun
    Duration: 1 Jan 2004 → …

    Conference

    ConferenceDokiya memorial international symposium on solid oxide fuel cells
    CityTokyo (JP), 24-25 Jun
    Period01/01/2004 → …

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