The influence of the morphology and the size of the particles of various types of starting AI2 03 material on the synthesis and characteristics of U-stabilized/3"-AI2 03 ceramics have been investigated. The use of highly dispersed oxides makes it possible to attain higher densities in the fired ceramic bodies due to their higher reactivity. In the case of oxides obtained from ammonium alum, the degree of dispersion and the reactivity may be increased by raising the amount of 3'-AI2 O3 up to a certain limit. Alumina prepared from AI2 (OH)s NO3 by slurry solution spray-drying also gives satisfactory results despite its lower degree of dispersion. This is connected with the morphology of the particles. In the case of synthesized materials containing an insufficient amount of/~-AI2 03 -NaAIO2 eutectic, high densities may also be achieved by applying a two-step firing schedule at temperatures above the melting point of the eutectic.
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