title: TEM study of 〈110〉-type 35.26° dislocations specially induced by polishing of SrTiO₃ single crystals.
abstract: 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 μm. 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° dislocations. The isolated 〈110〉-type 35.26° dislocations possess a compact core structure with a core spreading of ~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.
authors.affiliation: Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany; Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich, 52425 Jülich, Germany. Electronic address: l.jin@fz-juelich.de.
authors.forename: L
authors.initials: L
authors.lastname: Jin
authors.forename: X
authors.initials: X
authors.lastname: Guo
authors.forename: C L
authors.initials: CL
authors.lastname: Jia
mesh_terms: D003460:Crystallization; D017348:Microscopy, Electron, Scanning Transmission / Q000379:methods*; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D010087:Oxides; D014025:Titanium; C119252:strontium titanium oxide; D013324:Strontium
keywords: (Scanning) transmission electron microscopy; Faulted dipole; Glide dissociation; Strontium titanate; 〈110〉-type 35.26° dislocation