Infrared spectral studies of Zn-substituted Li-Mg ferrites

The infrared spectra of Zn-substituted Li-Mg ferrites, having the general f ormula LixMg0.4Zn0.6-2xFe2+xO4 (where x = 0, 0.05, 0.10, 0.15, 0.20, 0.25 a nd 0.3), have been analyzed in the frequency range 200-800 cm(-1). The ferr ites were prepared by standard double sintering ceramic method and the sing le-phase formation was confirmed by X-ray diffraction studies. The IR spect ra show two fundamental absorption bands nu(1) and nu(2) in the range 600-4 00 cm(-1), corresponding tetrahedral and octahedral complexes, respectively . The bands nu(1) and nu(2) are found to shift gradually towards the lower frequency side with addition of Zn, which have been attributed to the incre ase in the lattice parameter. The bands do not show any sign of splitting i ndicating no excess formation of Fe2+ ions. (C) 2000 Elsevier Science B.V. All rights reserved.