Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia

S. Azad, O. A. Marina, C. M. Wang, L. Saraf, V. Shutthanandan, D. E. McCready, A. El-Azab, J. E. Jaffe, M. H. Engelhard, C. H.F. Peden, S. Thevuthasan

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    Abstract

    Layer-by-layer structures of gadolinia-doped ceria and zirconia have been synthesized on Al2 O3 (0001) using oxygen plasma-assisted molecular beam epitaxy. Oxygen ion conductivity greatly increased with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia-doped ceria electrolytes. The conductivity enhancement in this layered electrolyte is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

    Original languageEnglish
    Article number131906
    Pages (from-to)1-3
    Number of pages3
    JournalApplied Physics Letters
    Volume86
    Issue number13
    DOIs
    Publication statusPublished - 28 Mar 2005

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    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Azad, S., Marina, O. A., Wang, C. M., Saraf, L., Shutthanandan, V., McCready, D. E., El-Azab, A., Jaffe, J. E., Engelhard, M. H., Peden, C. H. F., & Thevuthasan, S. (2005). Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia. Applied Physics Letters, 86(13), 1-3. [131906]. https://doi.org/10.1063/1.1894615