Infrared studies of some mixed Li-Cd ferrites

The infrared spectra of Li-Cd mixed ferrites with the general formula Li0.5 -x/2CdxFe2.5.x/2O4 (where x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7) have been analysed in the frequency range 200-800 cm(-1). The IR spectra reveal ed four absorption bands along with the shoulders for the samples with x = 0 to 0.3. For x > 0.3, the last bands viz. v(3) and v(4) got converted into shoulders. The IR bands along with their shoulders shifted gradually towar ds the lower frequency side with the addition of cadmium, which have been a ttributed to the increase in the lattice parameter. The shoulders appeared in the spectrum have been attributed to the presence of Fe2+ ions in excess amount in the samples.