| abstract |
Mn ferrite as a main phase and ferrite particles containing Sr ferrite as ferrite grains having a grain size distribution in the range of 2.5 to 4.5 占 퐉 and a standard deviation of the grain size on the grain surface of 1.5 占 퐉 to 3.5 占 퐉 . As a result, coating resin remains on the surface of the particles even after long-term use, whereby the charge characteristics are prevented from deteriorating. |