Effect of impurities on sintering and conductivity of yttria-stabilized zirconia |
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| Authors: | M. J. Verkerk A. J. A. Winnubst A. J. Burggraaf |
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| Affiliation: | (1) Department of Chemical Engineering, Laboratory for Inorganic Materials Science, Twente University of Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Present address: Philips Research Laboratories, Eindhoven, The Netherlands |
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| Abstract: | The effect of low concentrations of Fe2O3, Al2O3 and Bi2O3 on the sintering behaviour of (ZrO2)0.83 (YO1.5)0.17, made by alkoxide synthesis, has been investigated. The best results are achieved with Bi2O3 as a sinter agent and a relative density of 95% is obtained at 1200 K. The effects of these impurities on the electrical conductivity of the bulk and the grain boundaries has been investigated using frequency dispersion analysis (101-106 Hz). All investigated impurities have a negative influence on both the bulk and grain-boundary conductivity. For Fe2O3 and Al2O3 grain-boundary segregation factors of about two are calculated. |
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