| abstract |
The invention relates to an abrasive containing a slurry of the following cerium oxide grains as dispersed in water: n ( 1 ) Cerium oxide grains as obtained by adding hydrogen peroxide to an aqueous dispersion of cerium carbonate. n ( 2 ) Cerium oxide grains as obtained by oxidizing a precipitate, which is formed through addition of ammonium hydrogencarbonate to an aqueous solution of cerium nitrate, with hydrogen peroxide. n ( 3 ) Cerium oxide grains as obtained by neutralizing or alkalifying an aqueous solution of cerium ammonium nitrate. |