TY - JOUR
T1 - Titanium enrichment and strontium depletion near edge dislocation in strontium titanate [001]/(110) low-angle tilt grain boundary
AU - Takehara, K.
AU - Sato, Y.
AU - Tohei, T.
AU - Shibata, N.
AU - Ikuhara, Y.
N1 - Funding Information:
Acknowledgements A part of this work is supported by Grant-in-Aids for Young Scientist (B) and for Scientific Research on Innovative Areas ‘‘Nano Informatics’’ (25106003) from JSPS, Nihon Sheet Glass Foundation for Materials Science and Engineering, and Kato Foundation for Promotion of Science. The authors thank Prof. T. Mizoguchi, Mr. J. Hoemke, and Mr. A. Fukumoto of the University of Tokyo (UT) and Profs. T. Yamamoto and A. Nakamura of the Nagoya University for useful discussion, proofreading the manuscript, and experimental support. A part of this work was also supported by the Elements Strategy Initiative for Structural Materials (ESISM) and ‘‘Nanotechnology Platform’’ (Project No. 12024046), both sponsored by MEXT, Japan.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/6
Y1 - 2014/6
N2 - Dislocations are linear lattice defects in a crystalline solid. Since the unusual atomistic environment of the dislocation may greatly influence various material properties, control of the composition would offer more opportunities to obtain unique one-dimensional structures. In the present study, we have characterized the structure of dislocations in a low-angle tilt grain boundary of strontium titanate (SrTiO3). High-spatial resolution elemental mapping by electron energy loss spectroscopy combined with scanning transmission electron microscopy has enabled visualization of the enrichment of titanium (Ti) and the depletion of strontium (Sr) near the dislocation cores. The Ti enrichment and the Sr depletion have been observed at all of the dislocations, and the grain boundary is considered to be Ti excess. The extra Ti ions are located on the positions different from the normal perovskite lattice, suggesting that the local structure is largely reconstructed. It has been proposed that tensile strain at the dislocations may be a cause of the Ti enrichment.
AB - Dislocations are linear lattice defects in a crystalline solid. Since the unusual atomistic environment of the dislocation may greatly influence various material properties, control of the composition would offer more opportunities to obtain unique one-dimensional structures. In the present study, we have characterized the structure of dislocations in a low-angle tilt grain boundary of strontium titanate (SrTiO3). High-spatial resolution elemental mapping by electron energy loss spectroscopy combined with scanning transmission electron microscopy has enabled visualization of the enrichment of titanium (Ti) and the depletion of strontium (Sr) near the dislocation cores. The Ti enrichment and the Sr depletion have been observed at all of the dislocations, and the grain boundary is considered to be Ti excess. The extra Ti ions are located on the positions different from the normal perovskite lattice, suggesting that the local structure is largely reconstructed. It has been proposed that tensile strain at the dislocations may be a cause of the Ti enrichment.
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U2 - 10.1007/s10853-014-8034-5
DO - 10.1007/s10853-014-8034-5
M3 - Article
AN - SCOPUS:84897111225
SN - 0022-2461
VL - 49
SP - 3962
EP - 3969
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 11
ER -