Abstract
Dense zirconia-europia tetragonal solid solutions were obtained by sintering nanometer-sized powders produced by coprecipitation from solutions of zirconyl and europium nitrates hydrates. The tetragonal phase could be retained at room temperature for compositions of 2.0-4.0mol% Eu2O3. The fired materials had a fine microstructure, but those containing 2.0mol% Eu2O3 rapidly transformed from tetragonal into monoclinic cell upon cooling. The grain transformability in such polycrystals was dependent on the composition, because low doped samples had a critical grain-size for transformation, the lower the size the higher the content of Eu2O3. The ionic radius of the rare earth element used as a stabilizing oxide played an important role on the critical grain dimension for phase transformation. Eu3+ has a higher ionic radius than Er3+, but smaller than La3+. Accordingly, also its critical grain size was smaller than in the case of erbia, but higher than that of lanthana.
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