The
monodisperse spherical cerium dioxide was prepared by using wet solid phase mechanochemical method. The results of element
analysis and XRD pattern show that the milling process not only improves the dynamic and thermodynamic conditions of multiphase chemical reaction, but also in reinforces the crystallization process of product and simplifies the following treatment of product. The particle size decreases with the milling time increasing during the first 3 h and then is inclined to a relative stable value about sub-micrometer, which is related to the comprehensive action of the amorphous and crystallization both caused by mechanical grinding. The particle size variation during annealing process is found to be decreased with temperature rising before 900 ℃, and then increased from 900 to 1 100 ℃. However, the increase trend is not evident before 1 050 ℃, this means that no obvious aggregation is taken, and good dispersed
superfine cerium dioxide can be obtained when annealing the as-milled powder at the temperature range from 900 ℃ to 1 000 ℃. The final product is demonstrated to be
monodisperse spherical superfine cerium dioxide which possesses face-center cube structure.