Physicochemical properties of high-induction manganese-zinc ferrites

The degree of oxidation of ferrite powders from a high-quality batch is lower and that of parts sintered from them higher compared with a low-quality batch. Manganese-zinc ferrospinel parts of better quality are characterized by higher degrees of nonstoichiometry and inversion in the presence of manganese and iron cations of different valences. The lower electrical conductivity of these specimens is attributable to a complex character of reactions of cation-anion and electron-hole defects. To obtain high-quality manganese-zinc ferrites, it is necessary to create conditions preventing overoxidation during the stage of coprecipitation and synthesis of ferrite powders and enabling sintered parts to be produced whose spinel phase deviates slightly from stoichiometry in the direction of an excess of oxygen.