Patent ID: 8617994

Claim:
A polishing method comprising: supplying a polishing liquid composition between an object to be polished and a polishing pad; and polishing the object to be polished by moving the polishing pad relative to the object to be polished while the object to be polished is in contact with the polishing pad, the polishing liquid composition comprising: composite oxide particles containing cerium and zirconium; a dispersing agent; and an aqueous medium, wherein a powder X-ray diffraction spectrum of the composite oxide particles obtained by CuKÎ±1 ray, where Î»=0.154050 nm, irradiation includes a first peak having a peak top in a diffraction angle 2Î¸ range of 28.61 to 29.67Â°, wherein Î¸ is a Bragg angle, a second peak having a peak top in a diffraction angle 2Î¸ range of 33.14 in 34.53Â°, a third peak having a peak top in a diffraction angle 2Î¸ range of 47.57 to 49.63Â°, and a fourth peak having a peak top in a diffraction angle 2Î¸ range of 56.45 to 58.91Â°, wherein a half-width of the first peak is 0.8Â° or less, and wherein when there is at least one peak of a peak a 1 derived from a cerium oxide and a peak a 2 derived from a zirconium oxide in the powder X-ray diffraction spectrum, both heights of peak tops of the peaks a 1 , a 2 are 0% of a height of the peak top of the first peak, where the peak top of the peak a 1 lies in a diffraction angle 2Î¸ range of 28.40 to 28.59Â° and the peak top of the peak a 2 lies in a diffraction angle 2Î¸ range of 29.69 to 31.60Â°.