Nonstoichiometry and electrical transport in Sc-doped zirconia

The results of electrical conductivity measurements on ZrO 2:Sc (ScSZ) ceramics as a function of oxygen activity and temperature are presented. The influence of the microstructure on electrical transport is discussed and the experimental data for dense microcrystalline specimens have been compared w...

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Bibliographic Details
Published in:Solid state ionics 2002-12, Vol.152, p.431-438
Main Authors: Kosacki, Igor, Anderson, Harlan U, Mizutani, Yasunobu, Ukai, Kenji
Format: Article
Language:English
Subjects:
Defect equilibria
Impedance spectroscopy
Nanocrystals
Nonstoichiometry
Oxygen conductors
Thin films
Zirconia
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Summary:The results of electrical conductivity measurements on ZrO 2:Sc (ScSZ) ceramics as a function of oxygen activity and temperature are presented. The influence of the microstructure on electrical transport is discussed and the experimental data for dense microcrystalline specimens have been compared with those obtained for dense nanocrystalline thin films. From these results the electronic and ionic contribution to the electrical transport has been determined and correlated with microstructure. It has been found that nanocrystalline ScSZ films possess quite different nonstoichiometry compared with that observed for microcrystalline specimens in the fact that the electronic conductivity is enhanced so that it dominates the total conductivity in reducing atmospheres.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(02)00382-X