Agglomeration behavior of petal-shaped cerium carbonate with different operating conditions

Polymorph and Morphology Formation of Cerium Carbonate from Reactive Crystallization

“…Hrizi et al 27 obtained cerium hydroxide carbonate nanomaterials with different morphologies by varying the molar ratio of cetyltrimetylammonium bromide/Ce(NO 3 ) 3 •6H 2 O and other experimental parameters. Petal-shaped, nanosized Ce 2 (CO 3 ) 3 powders were produced by Hu et al 28 via liquid-phase precipitation method with the template agent of poly(allylamine hydrochloride), and it was found that the agglomeration phenomenon of Ce 2 (CO 3 ) 3 can be greatly prevented under the proper concentration of poly(allylamine hydrochloride), the pH value and the stirring speed.…”

“…Cerium carbonate, which is of novel electronic property, luminescent property and physicochemical property derived from the 4f electrons, has been given much attention as one of the most important rare-earth compounds. , Although it was found that cerium carbonate can exist as an anhydrate, octa hydrate, hydroxide, and other forms, the polymorph formation and the reactive crystallization kinetics are merely understood. In a series of studies, − the polymorph outcome and the morphology of cerium carbonate was found to be closely related to the crystallization conditions, such as crystallization method, ,− the reactant type, − temperature, − , additive type and amount, ,,, pH value, stirring rate, , and ultrasonication . Li et al reported a sonochemical method to produce quadrangular prisms of CeCO 3 OH from the aqueous solution of Ce­(NO 3 ) 3 ·6H 2 O and urea with the aid of poly­(vinyl alcohol), and proved that CeCO 3 OH crystals with uniform lengths and good dispersion present good room-temperature photoluminescence, which was also verified by Guo et al, and the morphology of CeCO 3 OH were found to be closely related with the concentration of reagents.…”