Patent ID: 7867461

Claim:
A method of preparing a cerium oxide powder for a CMP slurry by calcination treatment, which comprises the steps of: (a) preparing a cerium precursor by additionally adding one or more pore-forming materials and urea or ammonium carbonate; (b) decomposing the prepared cerium precursor by thermal treatment at temperature of 200 to 450° C. in an oxygen atmosphere; (c) dispersing and dry grinding the decomposed cerium precursor; and (d) calcinating the dispersed and dry grinded cerium precursor at temperature of 500 to 1000° C. in an oxygen atmosphere to obtain the cerium oxide powder having a crystal size of 10-60 nm, a specific surface area of 5-55 m 2 /g, and a pore distribution ratio, of pore less than and over 3 nm, of between 2:8 and 8:2, wherein the pore-forming materials are selected from the group consisting of an organic molecule, an organic polymer, and an organic solvent, and wherein the organic molecule and the organic polymer are pyrolyzable at temperature of 150 to 450° C. and the organic solvent has dielectric constant of 10 to 80.