Formation Mechanism of the Slice and Rod-like Cerium Dioxide Precursor Particles

摘要

Ultra-fine cerium dioxide precursor particles was prepared with cerium (Ⅲ) nitrate hexahydrate (Ce(NO_3)_36H_2O) and urea (CO(NH_2)_2) at 85°C by homogenous precipitation method. Effects of reaction and ageing time on the morphology of the precursor particles were studied, the morphology of precursor particles was characterized by scan electronic microscope and the crystallinity of the precursors was studied by X-ray diffraction. The result showed that the mono-dispersed spherical particles turned into flower and bundle-like particles as reaction time increasing, the particles turned into slice and rod-like particles as the ageing time increasing, the transition process occurred in ageing process was later than that in the reaction process, the spherical particles were less crystallization and the slice and the rod-like particles were at a state of fine crystallization.