TY - JOUR
T1 - Dislocation structures of low-angle boundaries in Nb-doped SrTiO 3 bicrystals
AU - Choi, S. Y.
AU - Buban, J. P.
AU - Nishi, M.
AU - Kageyama, H.
AU - Shibata, N.
AU - Yamamoto, T.
AU - Kang, S. J.L.
AU - Ikuhara, Y.
PY - 2006/5
Y1 - 2006/5
N2 - Dislocation core structures in low-angle boundaries of Nb-doped SrTiO 3 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].
AB - Dislocation core structures in low-angle boundaries of Nb-doped SrTiO 3 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].
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U2 - 10.1007/s10853-006-7824-9
DO - 10.1007/s10853-006-7824-9
M3 - Article
AN - SCOPUS:33744540775
VL - 41
SP - 2621
EP - 2625
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 9
ER -