Infrared spectral studies of Zn-substituted Li–Mg ferrites

Abstract The infrared spectra of Zn-substituted Li–Mg ferrites, having the general formula LixMg0.4Zn0.6−2xFe2+xO4 (where x=0, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.3), have been analyzed in the frequency range 200–800 cm−1. The ferrites were prepared by standard double sintering ceramic method and the single-phase formation was confirmed by X-ray diffraction studies. The IR spectra show two fundamental absorption bands ν1 and ν2 in the range 600–400 cm−1, corresponding tetrahedral and octahedral complexes, respectively. The bands ν1 and ν2 are found to shift gradually towards the lower frequency side with addition of Zn, which have been attributed to the increase in the lattice parameter. The bands do not show any sign of splitting indicating no excess formation of Fe2+ ions.