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- Title
Dislocation structures of low-angle boundaries in Nb-doped SrTiO<sub>3</sub> bicrystals.
- Authors
Choi, S.-Y.; Buban, J. P.; Nishi, M.; Kageyama, H.; Shibata, N.; Yamamoto, T.; Kang, S.-J. L.; Ikuhara, Y.
- Abstract
Dislocation core structures in low-angle boundaries of Nb-doped SrTiO3 bicrystals were investigated by high-resolution electron microscopy. Bicrystals with tilt angles of 2°, 4°, 6° and 8° with respect to the [001] zone axis were prepared by joining two single crystals at 1873 K. All of the boundaries consisted of a regular array of dislocations whose spacing gradually decreased with an increase in tilt angle. Except for the 2° tilt-angle boundary, the dislocation cores exhibited a dissociation from a[010] into two partials of a/2[010] on (100). Furthermore, two kinds of dislocation core structures were observed; Sr–Sr atomic columns and Ti–O atomic columns inside the cores. In addition, it was found that the positioning of adjacent cores along the boundary tended to change from a linear form to a zig-zagg shape as the tilt angle was increased from 4° to 8°. In the case of the linear array, dislocation core structures including Sr–Sr columns or Ti–O columns alternately appear. In contrast, only one core structure was observed in the zig-zagged array. On the other hand, the dislocation cores in the 2°-tilt-angle boundary had another type of dissociation with a/2[110] or a/2[111] partials, which included the twist component at a tilt axis of [001].
- Subjects
DISLOCATIONS in crystals; ELECTRON microscopy; DISSOCIATION (Chemistry); DEFORMATIONS (Mechanics); CRYSTALLOGRAPHY
- Publication
Journal of Materials Science, 2006, Vol 41, Issue 9, p2621
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-7824-9