Effect of grain orientation on abnormal grain growth in Ba-hexaferrite

The nucleation and growth behavior of Ba-hexaferrite has been observed and explained in terms of grain orientation due to liquid phase. It has been observed that the nuclei formation for abnormal grain growth was driven by the capillary force due to the liquid phase. A strong orientation of small grains was observed within abnormal grains in materials obtained using BaB2O4 as a sintering aid. The microstructural orientation of Ba-hexaferrite observed in this study was in good agreement with the X-ray diffraction analysis based on the peak intensity of the (107) plane.