Relative Energies of Tilt Boundaries in Aluminum Oxide
Authors:
- 1 December 1968
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 51 (12) , 688-692
Abstract
The relative grain boundary energy and surface diffusion coefficient of aluminum oxide were determined by observing the thermal grooving behavior of a series of bi‐crystals containing symmetric tilt boundaries. The relative energy for high tilt angles (30° to 150°) was roughly constant and equal to 0.54. The variation of relative energy with tilt angle was consistent with a dislocation core model for grain boundaries. The surface diffusion coefficient was: The agreement of this value for a vacuum etch with previous data for etches in air ruled out the oxygen ion as a possible rate‐controlling diffusion species.Keywords
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