A new process, based on the simultaneous gelling of alumina/zirconia precur
sors followed by hydrothermal treatment, may be used to produce mixed oxide
s composite powders with increased homogeneity. The aim of this paper is to
present zirconia powders characteristics as a function of synthesis condit
ions. Crystallite sizes are determined by X-ray diffraction, specific surfa
ce area by B.E.T. method, density by helium pyenometry. Powders are observe
d by T.E.M..