EELS and EDS Analysis
Figure 4: EELS elemental maps: a) Ti L2,3-edges at 456 eV; b) O K-edge at 532 eV; c) Mn L2,3-edges at 640 eV; d) La M4,5-edge at 832 eV; and e) Sr L2,3-edges at 1,940 eV.
edges. T e regions of the EELS spectrum from 0 eV to 500 eV and 400 eV to 900 eV were acquired nearly simultaneously with 10 μ s transition time between exposures of 0.037 ms and 25 ms, respectively. T e EDS data were recorded over the total pixel time of the DualEELS acquisition. T e entire 160×45 pixel spectrum imaging dataset was taken in just 3 minutes. Given the energy range allowed by this experiment, only the Ti-L, O-K, Mn-L and La-M edges were analyzed from the EELS data. The Sr-M edge at 130 eV was recorded but provides low SNR maps because of the high background in
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Figure 5 : EDS elemental maps: a) Ti K lines at 4.51 keV; b) O K lines at 0.52 keV; c) Mn K lines at 5.90 keV; d) La L lines at 4.65 keV; and e) Sr L lines at 1.81 keV.
this region of the EELS spectrum [ 18 ], and the Sr L-edge at 1,940 eV was beyond the energy window in this setup. Because EDS data was acquired simultaneously, the Sr intensity could be monitored from the EDS line at 1.81 keV. This map can then be combined with those obtained by EELS. The EDS data only deliver compositional information, thus chemical and bonding information was available only for Ti, O, Mn, and La.
Composition maps at this high-energy resolution confi g- uration were extracted from the area across the interface in
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