Patent ID: 7803711

Claim:
A method of chemically-mechanically polishing a substrate, which method comprises: (i) contacting a substrate comprising at least one layer of ruthenium with a polishing pad and a chemical-mechanical polishing composition comprising: (a) an abrasive consisting of (A) particles consisting of titanium dioxide having a rutile structure and (B) particles consisting of titanium dioxide having an anatase structure, wherein an x-ray diffraction pattern of the particles has a ratio of X/Y of about 0.5 or more, wherein X is an intensity of a peak in an x-ray diffraction curve representing a d-spacing of about 3.24 Å, and Y is an intensity of a peak in an x-ray diffraction curve representing a d-spacing of about 3.51 Å, and (b) water, (ii) moving the polishing pad and the polishing composition relative to the substrate, and (iii) abrading at least a portion of the ruthenium to polish the substrate.