The Effect of Precipitants on Ce-La Solid Solution Prepared from Mixed Rare Earth Chloride by a Co-Precipitation Method

Abstract

Abstract. Ce-La solid solution were prepared from mixed rare earth chloride via the co-precipitation method using various precipitants: urea, Na 2 CO 3 , NaHCO 3 , (NH 4 ) 2 CO 3 and NH 4 HCO 3 . The effects of the precipitants on the physicochemical properties, crystal structure and morphology of the Ce-La solid solution are investigated. The CL-urea sample displayed the largest surface area and the most uniform morphology. (NH 4 ) 2 CO 3 and NH 4 HCO 3 are confirmed to be more suitable precipitant than Na 2 CO 3 and NaHCO 3 for Ce-La solid solution preparation, because of the higher surface and less impurity residue of the corresponding samples. The effect of reverse method duing precipitation on Ce-La solid solution properties was not significant when the precipitant was excessive.