Journal
ULTRAMICROSCOPY
Volume 134, Issue -, Pages 77-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2013.06.009
Keywords
Strontium titanate; < 110 >-type 35.26 degrees dislocation; Glide dissociation; Faulted dipole; (Scanning) transmission electron microscopy
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Funding
- Deutsche Forschungsgemeinschaft [SFB 917]
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The dislocations created by mechanical polishing of SrTiO3 (100) single crystals were investigated by means of transmission electron microscopy (TEM) techniques combined with scanning TEM (STEM) techniques. A high density of dislocations was observed in the surface layer with a thickness of about 5 mu m. These dislocations were found to be straight and highly aligned along the < 111 > directions. In most cases they appear in pairs or as a bundle. The nature of the dislocations was determined as mixed < 110 >-type with the line vector t=< 111 >. They are < 110 >-type 35.26 degrees dislocations. The isolated < 110 >-type 35.26 degrees dislocations possess a compact core structure with a core spreading of similar to 0.5 nm. Dissociation of the dislocation occurs on the {1-10} glide plane, leading to the formation of two b=a/2 < 110 > partials separated by a stacking fault. The separation of the two partials was estimated to be 2.53 +/- 0.32 nm based on a cross-correlation analysis of atomic-resolution images. Our results provide a solid experimental evidence for this special type of dislocation in SrTiO3. The high density of straight and highly < 111 >-orientated dislocations is expected to have an important influence on the anisotropy in electrical and mass transport properties. (C) 2013 Elsevier B.V. All rights reserved.
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