INFLUENCE OF PREPARATION METHOD OF THE CEO_2 OVER THEIR STRUCTURAL CHARACTERISTICS

摘要

The aim this work is to synthesize the CeO_2 in the ceramic powder form through three different methods of synthesis, they are: method of combustion, Pechini method and hydrothermal method. Will be evaluated the influence exerted by these methods of preparing of the metallic oxide on the structural features presented in the same. Three samples of CeO_2 were synthesized in this work, they were analysed by x-ray diffraction, SEM and adsorption and desorption of N_2 by BET method. According to the results has been observed that the synthesis method has great influence on the structural characteristics of CeO_2 obtained. The sample of CeO_2 synthesized by Pechini method showed a structure with a higher percentage of crystallinity and average pore diameter smaller when compared to samples of CeO_2 synthesized by means of the combustion method and of the hydrothermal method. The sample synthesized by the combustion reaction method presented larger agglomerated of unitary particles.