Defect interactions and ionic transport in scandia stabilized zirconia

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

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18 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 - 2009
Externally publishedYes

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ASJC Scopus subject areas

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

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