| abstract |
Silica composite oxide particles comprising silica and a metal oxide othernthan silica, the content of the metal oxide other than silica being from 30 to 50 mol%,nand a coefficient of variation in the particle diameter being not larger than 30%. Thensilica composite oxide particles contain metal oxides other than silica in an amountnof not smaller than 30 mol%, which could not be produced thus far, and featurenexcellent spherical shape and excellent monodispersion property. |