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Nanosize ceria-zirconia ultrafine particles were prepared by the microemulsion method. HREM micrographs revealed that nanometer-sized particles were prepared and the shapes of them were uniform. The as-prepared particles were amorphous and the specific surface area of them was very large. The particle size ranged between 2 and 11 nm, and the mean particle size was evaluated to be 4 nm. The catalytic...