1. Atomic-Scale Chemical Imaging of Composition and Bonding by Aberration-Corrected Microscopy
- Author
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Niklas Dellby, David A. Muller, John Silcox, Harold Y. Hwang, M.F. Murfitt, Ondrej L. Krivanek, J. H. Song, and L. Fitting Kourkoutis
- Subjects
Chemical imaging ,Multidisciplinary ,Chemistry ,business.industry ,Analytical chemistry ,chemistry.chemical_element ,Electron ,Atomic units ,Optics ,Chemical bond ,Microscopy ,Scanning transmission electron microscopy ,business ,Spectroscopy ,Titanium - Abstract
Using a fifth-order aberration-corrected scanning transmission electron microscope, which provides a factor of 100 increase in signal over an uncorrected instrument, we demonstrated two-dimensional elemental and valence-sensitive imaging at atomic resolution by means of electron energy-loss spectroscopy, with acquisition times of well under a minute (for a 4096-pixel image). Applying this method to the study of a La 0.7 Sr 0.3 MnO 3 /SrTiO 3 multilayer, we found an asymmetry between the chemical intermixing on the manganese-titanium and lanthanum-strontium sublattices. The measured changes in the titanium bonding as the local environment changed allowed us to distinguish chemical interdiffusion from imaging artifacts.
- Published
- 2008
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