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Article
Quantifying Stoichiometry-induced Variations in Structure and Energy of a SrTiO3 Symmetric Σ13 {510}/<100 > Grain Boundary
Philosophical Magazine (2013)
  • H. Yang, University of California - Davis
  • H. S. Lee, University of Tokyo
  • M. C. Sarahan
  • Y. Sato, University of Tokyo
  • M. Chi, Oak Ridge National Laboratory
  • P. Moeck, Portland State University
  • Y. Ikuhara, University of Tokyo
  • N. D. Browning
Abstract
Grain boundaries (GBs) in complex oxides such as perovskites have been shown to readily accommodate nonstoichiometry changing the electrostatic potential at the boundary plane and effectively controlling material properties such as capacitance, magnetoresistance and superconductivity. Understanding and quantifying exactly how variations in atomic scale nonstoichiometry at the boundary plane extend to the practical mesoscale operating length of the system is therefore critical for improving the overall properties. Bicrystals of SrTiO3 were fabricated to provide the model GB model structures that are analysed in this paper. We show that statistical analysis of aberration-corrected scanning transmission electron microscope images acquired from a large area of GB is an effective routine to understanding the variation in boundary structure that occurs to accommodate nonstoichiometry. In the case of the SrTiO3 22.6° ∑13 (510)/[100] GB analysed here, the symmetric atomic structures observed from a micron-long GB can be categorized as two different competing structural arrangements, with and without a rigid-body translation along the boundary plane. How this quantified experimental approach can provide direct insights into the GB energetics is further confirmed from the first principles density functional theory, and the effect of nonstoichiometry in determining the GB energies is quantified.
Keywords
  • Scanning transmission electron microscopy,
  • Grain boundaries -- Analysis,
  • Image analysis -- Mathematics,
  • Atomic structure,
  • Strontium titanate
Disciplines
Publication Date
2013
Publisher Statement
© Philosophical Magazine, published by Taylor and Francis
Citation Information
H. Yang, H. S. Lee, M. C. Sarahan, Y. Sato, et al.. "Quantifying Stoichiometry-induced Variations in Structure and Energy of a SrTiO3 Symmetric Σ13 {510}/&lt;100 &gt; Grain Boundary" Philosophical Magazine Vol. 93 Iss. 10-12 (2013)
Available at: http://works.bepress.com/peter_moeck/30/