CRYOSOL METHOD - A NOVEL POWDER PROCESSING TECHNIQUE BASED ON ION-EXCHANGE PHENOMENA

A novel technique has been suggested for synthesis of highly dispersed oxide powders. The method is based on the treatment of aqueous soluti on of a multivalent metal nitrate (or chloride) by anion-exchange resi n in the OH- form, The presented technique yields a stable colloid sol ution of the corresponding hydroxide with concentration up to 1 M. The subsequent freeze-drying and thermal dehydration results in very fine powder of metal oxide. The individual and multicomponent oxides obtai ned by the cryosol method were shown to possess unusual properties due to their high dispersity and chemical homogeneity.