SIGMA-5(210) [001] SYMMETRICAL TILT GRAIN-BOUNDARY IN YTTRIUM-ALUMINUM-GARNET/

The Sigma 5 (210)/[001] symmetric tilt grain boundary in yttrium alumi num garnet (YAG) was produced by diffusion bonding precisely oriented single crystals. The crystals were cleaned and bonded in an ultra-high -vacuum environment, The atomic structure of the boundary was characte rized by high-resolution transmission electron microscopy. Model atomi c structures were created by geometric construction to form the coinci dent site lattice model boundary, Comparison of model structures with high-resolution micrographs was performed by high-resolution image sim ulation. Many aspects of the boundary structure were properly represen ted by the models, but some details of the high-resolution images indi cated that differences existed.