Structural variability of edge dislocations in a SrTiO3 low-angle [001] tilt grain boundary

Using a spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS), we investigated a 6° low-angle [001] tilt grain boundary in SrTiO3. The enhanced spatial resolution of the aberration corrector leads to the observation of a num...

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Bibliographic Details
Published in:Journal of materials research 2009-07, Vol.24 (7), p.2191-2199
Main Authors: Buban, James P., Chi, Miaofang, Masiel, Daniel J., Bradley, John P., Jiang, Bin, Stahlberg, Henning, Browning, Nigel D.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Dislocations
Inorganic Chemistry
Materials Engineering
Materials Science
Nanotechnology
Outstanding Symposium Papers
Oxide
Scanning transmission electron microscopy (STEM)
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Summary:Using a spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS), we investigated a 6° low-angle [001] tilt grain boundary in SrTiO3. The enhanced spatial resolution of the aberration corrector leads to the observation of a number of structural variations in the edge dislocations along the grain boundary that neither resemble the standard edge dislocations nor partial dislocations for SrTiO3. Although there appear to be many variants in the structure that can be interpreted as compositional effects, three main classes of core structure are found to be prominent. From EELS analysis, these classifications seem to be related to Sr deficiencies, with the final variety of the cores being consistent with an embedded TiOx rocksalt-like structure.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2009.0259