The grain boundary (GB) character of a Mn-Zn ferrite (MZF) specimen exhibiting abnormal grain growth (AGG) was investigated using the electron backscatter diffraction (EBSD) technique. As well as the conventional misorientation angle distribution, the misorientation axis distribution was examined. The distributions were compared to those of the random orientation and geometric criteria for special boundaries of Coincident-Site-Lattice (CSL) and Plane-Matching (PM) models were applied. A close to random misorientation distribution of the AGG microstructure, despite the anisotropy in GB energy, was attributed to the existence of liquid phase arresting further evolution by a solid-state wetting mechanism.

Keywords: Mn-Zn Ferrite, electron backscatter diffraction, misorientation distribution, abnormal grain growth