The FTIR spectra of CeO2 showed a broad band close to 3500 cm -1 corresponding to the O-H stretching vibration of residual water and hydroxyl groups. The band at 1647 cm-1 was due to the scissor bending mode of associated water. The other bands correspond to Ce-O metal-oxygen bonds with the most intense at 2300 cm -1 (Fig ). The distortion occurring in the Ce-O lattice due to oxygen vacancies and Ce +3 in nanosized ceria leads to a diminished FTIR spectrum with broad bands.