Direct observation of charge mediated lattice distortions in complex oxide solid solutions

Using aberration corrected scanning transmission electron microscopy combined with advanced imaging methods, we directly observe atom column specific, picometer-scale displacements induced by local chemistry in a complex oxide solid solution. Displacements predicted from density functional theory we...

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Bibliographic Details
Published in:Applied physics letters 2015-02, Vol.106 (6)
Main Authors: Sang, Xiahan, Grimley, Everett D., Niu, Changning, Irving, Douglas L., LeBeau, James M.
Format: Article
Language:English
Subjects:
Applied physics
ATOMIC DISPLACEMENTS
ATOMS
BONDING
CHARGE DISTRIBUTION
Chemical bonds
Columns (structural)
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY FUNCTIONAL METHOD
Density functional theory
Displacements (lattice)
Microscopy
Organic chemistry
OXIDES
SCANNING ELECTRON MICROSCOPY
Scanning transmission electron microscopy
SOLID SOLUTIONS
TRANSMISSION ELECTRON MICROSCOPY
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Summary:Using aberration corrected scanning transmission electron microscopy combined with advanced imaging methods, we directly observe atom column specific, picometer-scale displacements induced by local chemistry in a complex oxide solid solution. Displacements predicted from density functional theory were found to correlate with the observed experimental trends. Further analysis of bonding and charge distribution was used to clarify the mechanisms responsible for the detected structural behavior. By extending the experimental electron microscopy measurements to previously inaccessible length scales, we identified correlated atomic displacements linked to bond differences within the complex oxide structure.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4908124