Faceting was characteristic of both special and incommensurate grain boundaries. The orientation of a facet was related to the misorientation angle between the grains. The faceting effect was analyzed here in a kinetic model for the faceting phase transition and the formation of pyramids of facets adjacent to one another.

Two-Dimensional Faceting Kinetics of Grain Boundaries. V.G.Kulkov: Inorganic Materials, 2005, 41[11], 1243-6