Alumina bicrystals, which contained a glassy phase, were produced by hot-pressing. Annealing the bicrystals at high temperatures, where a liquid formed at the boundary, could result in migration of the grain boundary. Such migration proceeded via a solution/re-precipitation mechanism. Many of the features of this migration closely resembled diffusion-induced grain-boundary migration, but some important differences were identified.

Migration of Alumina Grain Boundaries Containing a Thin Glass Film. N.Ravishankar, C.B.Carter: Acta Materialia, 2001, 49[11], 1963-9