Abstract
AbstractMixed ferrites with the chemical formula Mg0.5Cu0.5GaxFe2–xO4 (0.0 ≤ x ≤ 0.5) were prepared by a ceramic route. X‐ray diffraction results confirmed the presence of single‐phase spinel structure for these samples. Electrical properties of these ferrites at various compositions were investigated from room temperature up to 550 K in the frequency range 102–105 Hz. The obtained results revealed semiconductor behavior at high frequency and metallic behavior at low frequency in these materials. All studied compositions exhibit a transition with a change in the slope of the conductivity versus temperature curve. The obtained transition temperature TC is found to decrease linearly with increasing Ga concentration. As Ga substitutes Fe in these compounds the activation energy for electrical conduction in the ferrimagnetic region (Ef) has a small variation with frequency. In contrast, the activation energy in the paramagnetic region (Ep) shows undefined behavior reflecting the nature of this disordered state. The relation of the universal exponent s with temperature gives evidence for the presence of the large overlap polaron (LOP) hopping conduction mechanism in these compounds. The obtained results are explained in the light of the cation–anion–cation and cation–cation interactions present over the octahedral B‐sites in the spinel structure. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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