A novel method for preparation of nano-size spherical ceria by milling hydrated cerium carbonate with sodium chloride as grind aid agent and agglomeration inhibitor was investigated. The effects of mass ratio of hydrated cerium carbonate to sodium chloride,milling time, calcination temperature on CeO2 crystallite size were investigated by means of XRD. TEM micrograph of final product shows that CeO2 powder obtained is spherically-shaped particle with crystallite size in the range of 30-50 nm. The resuhs show that the co-existing sodium chloride in as-milled powders takes an important role for the formation of spherical ceria nanoparticle. And its grind-aiding and agglomer-ation-inhibiting action during milling and subsequentealeing period were discussed.
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