The infrared absorption and dielectric properties of Li–Ga ferrite

The investigated compositions of the Li–Ga ferrite system Li0.5Fe2.5−xGaxO4 (where x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) were studied by means of infrared (IR) spectroscopy. The analysis of IR spectra indicates the presence of splitting in the absorption band due to the presence of Fe2+ ions in ferrite. The dielectric constant ɛ′, the dielectric loss ɛ″ and the loss tangent tan δ were measured at elevated temperatures ranging from room temperature up to 850 K as a function of frequency (f = 102–106 Hz) for the investigated compositions. Maximum peak in tan δ and inverse peaks in ɛ′ appeared for some samples due to the resonance phenomenon. The obtained data were discussed based on the valence exchange between (Fe3+ and Fe2+) and (Ga3+ and Ga2+), i.e. hopping mechanism.