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Title: Interfacial dislocations in (111) oriented (Ba{sub 0.7}Sr{sub 0.3})TiO{sub 3} films on SrTiO{sub 3} single crystal

We have investigated the interfacial structure of epitaxial (Ba,Sr)TiO{sub 3} films grown on (111)-oriented SrTiO{sub 3} single-crystal substrates using transmission electron microscopy (TEM) techniques. Compared with the (100) epitaxial perovskite films, we observe dominant dislocation half-loop with Burgers vectors of a〈110〉 comprised of a misfit dislocation along 〈112〉, and threading dislocations along 〈110〉 or 〈100〉. The misfit dislocation with Burgers vector of a〈110〉 can dissociate into two ½a〈110〉 partial dislocations and one stacking fault. We found the dislocation reactions occur not only between misfit dislocations, but also between threading dislocations. Via three-dimensional electron tomography, we retrieved the configurations of the threading dislocation reactions. The reactions between threading dislocations lead to a more efficient strain relaxation than do the misfit dislocations alone in the near-interface region of the (111)-oriented (Ba{sub 0.7}Sr{sub 0.3})TiO{sub 3} films.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ; ; ;  [5] ; ;  [6] ;  [1]
  1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Science, and Collaborative Innovation Center of Advanced Materials, Nanjing University, Nanjing 210093 (China)
  2. (United States)
  3. Department of Materials, Physics and Energy Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 (Japan)
  4. (Japan)
  5. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  6. Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502 (Japan)
Publication Date:
OSTI Identifier:
22482199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BURGERS VECTOR; DISLOCATIONS; EPITAXY; FILMS; MONOCRYSTALS; PEROVSKITE; RELAXATION; STACKING FAULTS; STRAINS; STRONTIUM TITANATES; SUBSTRATES; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY