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

Published online by Cambridge University Press:  31 January 2011

James P. Buban ,
Miaofang Chi ,
Daniel J. Masiel ,
John P. Bradley ,
Bin Jiang ,
Henning Stahlberg  and
Nigel D. Browning
James P. Buban*
Affiliation:
Department of Molecular and Cellular Biology, University of California−Davis, Davis, California 95616
Miaofang Chi
Affiliation:
Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, California 94550; and Department of Chemical Engineering and Materials Science, University of California−Davis, Davis, California 95616
Daniel J. Masiel
Affiliation:
Department of Chemical Engineering and Materials Science, University of California−Davis, Davis, California 95616
John P. Bradley
Affiliation:
Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, California 94550
Bin Jiang
Affiliation:
FEI Company, Hillsboro, Oregon 97124
Henning Stahlberg
Affiliation:
Department of Molecular and Cellular Biology, University of California−Davis, Davis, California 95616
Nigel D. Browning
Affiliation:
Department of Chemical Engineering and Materials Science, University of California−Davis, Davis, California 95616; and Condensed Matter and Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550
*
a) Address all correspondence to this author. e-mail: jpbuban@ucdavis.edu
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Abstract

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.

Keywords

DislocationsOxideScanning transmission electron microscopy (STEM)
Type
Outstanding Symposium Papers
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2191 - 2199
Copyright
Copyright © Materials Research Society 2009

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