This chapter compares the electromagnetic behavior of CoFe2O4 with and without addition of Nb2O5 in order to find biomedical applications of these compositions. Taking into account that their electromagnetic behavior is affected by their morphological structure, a structural analysis of samples prepared with different stoichiometries and sintered at different temperatures was performed. The formation of a new phase and the presence of lamellar veins crystallographically oriented by their magnetic domains were identified. In addition, complex measurements of electrical permittivity and magnetic permeability allowed us to infer that maximum absorption frequency increases with the addition of niobium pentoxide, while hysteresis cycles indicated a decrease in saturation magnetization and an increase in coercive force.
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