Defect interactions and ionic transport in scandia stabilized zirconia

R. Devanathan, S. Thevuthasan, J. D. Gale

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    Classical molecular dynamics simulation has been used to study ionic transport in scandia-stabilized zirconia, as well as scandia and yttria-co-doped zirconia, as a function of temperature and composition. The oxygen diffusion coefficient shows a peak at a composition of 6 mol% Sc2O3. At 1125 K and higher temperatures, oxygen vacancies prefer to be second nearest neighbours to yttrium ions and first neighbours to scandium ions, because the defect interactions in scandia-stabilized zirconia are governed mainly by electrostatic effects. Oxygen migration between cation tetrahedra is impeded less effectively by Sc-Sc edges than by Y-Y edges. The formation of neutral dopant-anion vacancy clusters is favoured, in agreement with recent nuclear magnetic resonance observations.

    Original languageEnglish
    Pages (from-to)5506-5511
    Number of pages6
    JournalPhysical Chemistry Chemical Physics
    Volume11
    Issue number26
    DOIs
    Publication statusPublished - 28 Sep 2009

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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