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 ob served that the nuclei formation for abnormal grain growth was driven by th e capillary force due to the liquid phase. A strong orientation of small gr ains was observed within abnormal grains in materials obtained using BaB2O4 as a sintering aid. The microstructural orientation of Ba-hexaferrite obse rved in this study was in good agreement with the X-ray diffraction analysi s based on the peak intensity of the (107) plane. (C) 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved.