期刊
SCIENCE
卷 319, 期 5866, 页码 1073-1076出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1148820
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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.
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