Dislocation structures of low-angle boundaries in Nb-doped SrTiO3 bicrystals

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 degrees with respect to the [001] zone axis were prepared by joining two single crystals at 1873 K. All of the boun...

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Bibliographic Details
Published in:Journal of materials science 2006-05, Vol.41 (9), p.2621-2625
Main Authors: Choi, S-Y, Buban, J P, Nishi, M, Kageyama, H, Shibata, N, Yamamoto, T, Kang, S-J L, Ikuhara, Y
Format: Article
Language:English
Subjects:
Attitude (inclination)
Bicrystals
Boundaries
Columns (structural)
Dislocations
High resolution electron microscopy
Linear arrays
Materials science
Niobium
Single crystals
Strontium titanates
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Summary: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 degrees 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 degree 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 seen; Sr-Sr atomic columns and Ti-O atomic columns inside the cores. It was also found that the positioning of adjacent cores along the boundary tended to change from a linear form to a zig-zag shape as the tilt angle was increased from 4 to 8 degrees. 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-zag array. On the other hand, the dislocation cores in the 2 degree-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]. 14 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-7824-9