Enhanced Oxygen Diffusivity in Interfaces of Nanocrystalline ZrO2 · Y2O3

First measurements of oxygen grain boundary diffusion coefficients in nanocrystalline yttria-doped $ZrO_2\>(n\!-\!ZrO_2\!\cdot\!6.9\>mol\>\%\>Y_2O_3$) are presented. The 18O diffusion profiles measured by secondary ion mass spectroscopy are much deeper in the nanocrystalline specimens th...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 100; no. 7; pp. 3870 - 3873
Main Authors Knöner, Gregor, Reimann, Klaus, Röwer, Ralf, Södervall, Ulf, Schaefer, Hans-Eckhardt
Format Journal Article
LanguageEnglish
Published National Academy of Sciences 01.04.2003
National Acad Sciences
The National Academy of Sciences
Subjects
Crystallites
Cubic crystals
Diffusion coefficient
Enthalpy
Grain boundaries
Ions
Mass spectroscopy
Oxygen
Physical Sciences
Single crystals
Sintering
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Summary:First measurements of oxygen grain boundary diffusion coefficients in nanocrystalline yttria-doped $ZrO_2\>(n\!-\!ZrO_2\!\cdot\!6.9\>mol\>\%\>Y_2O_3$) 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 $(-0.91\>eV/k_BT)\>m^2/s$, and the oxygen surface exchange coefficient, k = 1.4 × 10-2 exp $(-1.13\>eV/k_BT)\>m/s$, are derived.
Bibliography:Communicated by Manuel Cardona, Max Planck Institute for Solid State Research, Stuttgart, Germany
To whom correspondence should be addressed. E-mail: gknoener@itap.physik.uni-stuttgart.de.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0730783100