Atomic-Scale Chemical Imaging of Composition and Bonding by Aberration-Corrected Microscopy
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- 22 February 2008
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 319 (5866) , 1073-1076
- https://doi.org/10.1126/science.1148820
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 La0.7Sr0.3MnO3/SrTiO3 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.Keywords
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