The occurrence of diffusion-induced grain-boundary migration in Ba(Nb2/3Zn1/3)O3 ceramics was investigated in specimens with a small (3.0) or large (31.4) grain size. The specimens were embedded in Nb2O5 or ZnO powders, and heat-treated at 1250 or 1310C, respectively. It was found that the grain boundaries of the small grain-size specimens were immobile, while those of the large grain-size specimens migrated away from their centers of curvature.

J.K.Park, D.Y.Kim: Journal of the American Ceramic Society, 1996, 79[5], 1405-8