Abstract
Relations between granular structure and magnetic properties of Mn-Zn ferrite are presented. In order to obtain ferrite specimens with different granular structures in the same chemical composition, four powder samples having different grain growth characteristics were prepared from the same raw material mixture under the different calcining and ball-milling conditions, and their compacts were fired under the same temperature.
It is shown that under the conditions studied flux density is determined by the fired density irrespective of the granular structure, but that initial permeability, coercive force and quality factor have much to do with granular structure. It is shown also that the grain size has little effect on the magnetic properties. It is stressed, however, that the intergranular pores are highly responsible for the degradation of magnetic properties.
