Figure 2.
XPS spectra of individual elements: Sr 3d (a); Pr 3d (b); Mg 1s (c); Ti 2p (d); Fe 2p (e); and O 1s (f) of Sr0.5Pr0.5Fe0.4–xMgxTi0.6O3−δ [x = 0, 0.1, and 0.2].
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