Microstructural Control of Mn-Zn Ferrite with Addition of Seed Grains

Abstract
In order to obtain desired electromagnetic properties, high initial permeability and good frequency dependance of initial permeability, seeding effects are experimented in Mn-Zn ferrite system. As adding seed grain, calcined at sintering temperature, abnormal grains are disappeared clearly, but the density of sintered Mn-Zn ferrite body and initial permeability of this ferrite body are decreased. On the contrary, in case of adding seed grain which were calcined below the calcination temperature of matrix particle, abnormal grains were remain but the initial permeability is increased with proper seed content. Compared these results with those of experiments on additive variations, mean particle size controls, sintering conditions, seeding affects on the microstructure of Mn-Zn ferrite similarly.