Abstract
The effects of alumina additions on the sintering behavior of gadolinia-doped ceria were systematically investigated in terms of the variations in sintered density and grain size and the existing forms of Al 2O 3 in CeO 2. Sintered density increased with increasing Al 2O 3 content up to 2 mol% and then it decreased with further addition of Al 2O 3. Grain size also increased with increasing Al 2O 3 content up to 2 mol% and then decreased with further addition of Al 2O 3. Decrease in grain size was caused by a pinning effect of Al 2O 3 precipitated at grain boundaries. Lattice constant decreased with increasing Al 2O 3 content up to 2 mol%. This decrease is due to the substitution of smaller Al 3+ ions for Ce 4+ ions in the CeO 2 structure. According to the results obtained from SEM and XRD analyses, the solubility limit of Al 2O 3 in Ce 0.8Gd 0.2O 1.9 ceramics was found to be nearly 2 mol%. The addition of Al 2O 3 up to the solubility limit was found to promote the sintering properties of Gd 2O 3-doped CeO 2.
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