文摘
The synthesis of Ce1-xPrxO2 solid solutions by three different methods (flux method,coprecipitation, and solid-state reactivity) has been investigated to establish optimalpreparation conditions. The system studied was chosen because of its thermal and chemicalproperties and because of its utility as red and orange ceramic pigments. The results obtainedshowed that the Ce1-xPrxO2 solid solution can be achieved using all three preparationtechniques. The three synthesis methods-flux, coprecipitation, and solid-state reaction-vary with regard to both the time and temperature used in the heat treatments, and thecharacteristics of the powders obtained (purity, morphology, granularity). In the preparationof powders by the flux method, the use of molten salts ensures a notable acceleration of thereaction kinetics. We found that the eutectic NaOH-KOH is particularly effective. Thesamples obtained exhibited a clearly spherical shape together with a considerable fineness.This nonconventional technique thus enables the synthesis of extremely homogeneouscompounds that are especially suitable in industrial application such as pigments used indecorative ceramic materials. The solid solutions obtained are, indeed, able to develop anintense red coloring, especially these with a Pr content of 5 mol %.
