Low-angle tilt grain boundaries in [001] fiber-textured BaTiO3 thin films were investigated by high-resolution transmission electron microscopy. Extensive observations revealed a very high density of low-angle tilt grain boundaries in the film. The low-angle tilt grain boundaries could be described as being periodic arrays of dislocations on {100} and {110} boundary planes. The boundaries with (100) plane on {100} planes were composed of perfect dislocations having a Burgers vector of a<100> (a = lattice constant of BaTiO3: 0.3992nm), while boundaries with the (110) plane on {110} planes were composed of dissociated dislocations with a Burgers vector of a/2<110>. It was thus found that the difference in the boundary plane led to different dislocation structures along the low-angle grain boundaries.

HRTEM Study of [001] Low-Angle Tilt Grain Boundaries in Fiber-Textured BaTiO3 Thin Films. M.Igarashi, Y.Sato, N.Shibata, T.Yamamoto, Y.Ikuhara: Journal of Materials Science, 2006, 41[16], 5146-50