Relation Between Initial Permeability and Fe²⁺ Ion of Mn-Zn Ferrite Systems

Abstract

The effects of Fe²⁺ ion content on the initial permeability have been studied in Mn-Zn ferrites of various Mn/Fe ratios. The initial permeability and resistivity depend substantially on the Fe²⁺ ion content at. the regions containing a small excess of Fe₂O₃ over the stoichiometric composition.
While, when additives are used, the relation between initial permeability and resistivity can not be simply compared to none additive ferrites.
It was found that the values of initial permeability of Mn-Zn ferrite systems containing small amount of Te or MoO₃ were strongly dependent on the Fe²⁺ ion content, but the resistivity values were nearly independent upon the presence of Fe²⁺ ions. The conduction mechanism of resistivity of the materials containing additives could not be explained on the theory of the electron transfer of Fe²⁺ ?? Fe³⁺ ion at the B-site in spinel lattice. Some explanations of these additive effects are presented.