Cerium oxide powder and dispersion thereof

摘要

Ceric oxide powder (I) of crystalline primary particles with carbonate groups on surface and in layer near surface has Brunauer Emmett Teller (BET) surface area 25-150 m 2>/g, average primary particle diameter 5-50 nm and surface layer about 5 nm deep; has carbonate concentration decreasing continuously from surface, so that carbon (C) content from carbonate groups is 5-50 area-% at surface and 0-30 area-% at depth of about 5 nm; and contains not less than 99.5 wt.% ceric oxide, calculated as CeO 2, and 0.01-0.3 wt.% (in)organic C with respect (I). Independent claims are included for the following: (1) production of (I); (2) (I) produced by this process; (3) dispersion containing (I); (4) use of (I) or dispersion for chemical-mechanical polishing; (5) use of (I) as catalyst, UV absorber, toner component or constituent of fuel cells.