Preparation of multicomponent powders are veryuseful and important for producing the materials with complicatedand homogeneous structure. Therefore multicomponent powdershave a lot of attention in the field of advanced value-addedmaterials. The aqueous processing in hydrometallurgy has a broadpotential for producing multicomponent homogeneousprecipitates. Furthermore the aqueous processing has a futurepotential for integrating the separation, precipitation and synthesisprocesses. In this presentation the precipitation from homogeneoussolution including rare-earths and/or common metals is presented.These precipitates probably consist of almost monodispersed,multicomponent and spherical particles by precisely controllingseveral reaction factors, reaction temperature, concentrations ofstarting materials, pH and so on. The separation of the nucleationstage and the growth stage of the particles is very important andhow to control the reaction factors to realize enough separation isdiscussed. In this presentation the systems of Y-Eu-O, Y-Fe-O andY-Al-O are mainly presented. In addition the precipitation-stripping method from organic phase is presented focusing thesynthesis of multicomponent powders of Ni-La-O system. Theseprecipitates have multicomponents homogeneously and so they areconverted to multicomponent ceramic powders by calcination.They are important compounds as phosphor, opto-magneticmaterials, optical materials, hydrogen storage alloy or as therelated precursors. In this presentation some characterization ofthese particulate materials is included.
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