Ionic conductivity ageing behaviour of 10  mol.% Sc2O3-1mol.% CeO2-ZrO2 ceramics

The long-term ionic conductivity behaviour of samples of zirconia co-doped with 10mol.% of Sc2O3 and 1mol.% CeO2 is evaluated in oxidizing and reducing atmospheres at 600 degree C. After 3,000h, the sample kept in reducing atmospheres exhibits 20% loss in the ionic conductivity, while the sample kep...

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Bibliographic Details
Published in:Journal of materials science 2010-12, Vol.45 (23), p.6406-6410
Main Authors: Omar, Shobit, Bonanos, Nikolaos
Format: Article
Language:English
Subjects:
Aging
Cations
Ceramics
Electrical resistivity
Grain boundaries
Ionic conductivity
Lattices
Reducing atmospheres
Zirconium dioxide
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Summary:The long-term ionic conductivity behaviour of samples of zirconia co-doped with 10mol.% of Sc2O3 and 1mol.% CeO2 is evaluated in oxidizing and reducing atmospheres at 600 degree C. After 3,000h, the sample kept in reducing atmospheres exhibits 20% loss in the ionic conductivity, while the sample kept in air shows 6% degradation. No phase transitions were observed in the samples after both the ageing studies. The main contribution towards the loss in the ionic conductivity of the sample kept in air comes from grain boundaries; however, for the sample aged in reducing conditions, both grain and grain boundary contribute similarly towards the increase in the total resistivity. This is tentatively explained by the reduction of Ce4+ cations, dissolved in the fluorite lattice of ZrO2.
ISSN:0022-2461
DOI:10.1007/s10853-010-4723-x