Abstract
CeOHCO 3 powders have been directly synthesized using a hydrothermal process at temperatures as low as 160°C. The well-dispersed powders are obtained in a short period of reaction time during hydrothermal reaction via the hydrolysis of urea. For synthesizing CeOHCO 3, the concentration of urea is found to be a crucial determinant, which has significant effects on the morphology of the derived powders. When low urea concentrations are provided, the formed particles are rhomboidal platelets. On the other hand, the high urea concentrations cause the shape of the powders to become prismatic. Increasing the concentration of urea tends to increase the particle size as well as the aspect ratio of CeOHCO 3 powders. After further heating at 500°C, a phase transformation from orthorhombic CeOHCO 3 to cubic CeO 2 takes place. The crystallinity and size of CeO 2 strongly depend on the particle size of CeOHCO 3.
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