Infrared absorption spectra of pure and doped SrTiO[3]

ABSTRACT

The infrared absorption spectra of pure SrTiO[3] and when doped by CuO, Gd[2]O[3] or CeO[2] with different concentrations namely [0.5, 1.0, 3.0, and 5.0 Mole percent] have been measured. The I.R absorption measurements in the range 200-4000 cm[-1] revealed two main absorption bands in the ranges 380-400 cm[-1] and 540-610 cm[-1], which were assigned to two TiO[6] octahedral normal modes. Some bands at 217, 237 and 260 cm[-1] which were due to cation-TiO[3] vibration are also observed. Two absorption bands at 1020, 1100 cm of higher intensities were observed due to metal-oxygen bond. The main bands still present in all samples with slight shift and broadening in band positions with increasing dopant concentrations which favour the formation of the tetragonal modification