Enhanced oxygen diffusivity in interfaces of nanocrystalline ZrO2⋅Y2O3
AUTOR(ES)
Knöner, Gregor
FONTE
The National Academy of Sciences
RESUMO
First measurements of oxygen grain boundary diffusion coefficients in nanocrystalline yttria-doped ZrO2 (n-ZrO2⋅6.9 mol % Y2O3) are presented. The 18O diffusion profiles measured by secondary ion mass spectroscopy are much deeper in the nanocrystalline specimens than in single crystals. An oxygen diffusivity, DB, in the grain boundaries can be deduced, which is ≈3 orders of magnitude higher than in single crystals. From the present data the temperature variation of the oxygen grain boundary diffusivity, DB = 2.0 × 10−5 exp (−0.91 eV/kBT) m2/s, and the oxygen surface exchange coefficient, k = 1.4 × 10−2 exp (−1.13 eV/kBT) m/s, are derived.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=153014Documentos Relacionados
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