Ultrafine particles of Mn+-doped ceria (Mn+=Mg2+, Ca2+, Sr2+, Ba2+, Y3+, La3+, Nd3+, Sm3+, Eu3+, Tb3+) for UV filter were prepared via soft solution chemical routes at 40°C. X-ray diffraction revealed that the prepared doped particles had the cubic fluorite structures although peak positions changed depending on the kind and amount of doped metal ion. Doping with 20mol% Ca2+ and 20mol% Zn2+ resulted in extremely decreasing the particle size (2-4nm) and the catalytic activity of ceria for oxidation of castor oil. Ca2+-doped cerium dioxide showed excellent UV absorbing effect and transparency in the visible ray region compared with undoped cerium dioxide.
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