Abstract
Abstract ac conductivity and magnetic behaviour have been studied for a series of polycrystalline ferrite with general formula Mn 1− x Fe 2−2 x Ti x O 4 , (0 ≤ x ≤ 0.5), prepared using a conventional solid-state reaction technique. The results of ac conductivity show that σ ac increases as the frequency and the temperature increase; whereas it decreases as Ti content increases except for a sample x = 0.1. The values of activation energies E f for conduction process are determined from Arrhenius plots, and the variations of these activation energies as a function of composition have been discussed. The conduction mechanism used in present study have been discussed in the light of electron exchange between Fe 2 and Fe 3 ions and hole hopping between Mn +3 and Mn +2 ions at the octahedral B-sites. It observed that the saturation magnetization decreases with increase Ti 4+ substitution, which is explained by the weakening of the exchange in the system according to Neel's molecular field model.
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