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(a) Five overlapped zero-loss EELS spectra acquired from the same area within . The drift of the zero-loss spectra was less than . (b) The sum of four low-loss EELS spectra with energy losses of 0, 10, 20, and .
TEM images of (a) ordered and (c) disordered . The corresponding SAED patterns are shown in (b) and (d), respectively. (b) shows superlattice reflections and for order structure, while (d) has no superlattice reflections.
edges of Fe and Ni from ordered (dashed line) and disordered (solid line) , respectively. The threshold energies of the edges of Fe and Ni from disordered phase are lower and higher than those from ordered phase, respectively.
Normalized Ni edges from ordered (dashed line) and disordered (solid line) as well as Fe edge from pure Fe (dotted line). The inset shows the enlarged Fe edge.
Normalized Fe edges from ordered (dashed line) and disordered (solid line) . The insets show the enlarged Fe and edges.
occupancies of disordered , ordered , pure Fe, and pure Ni (unit: ).
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