X‐ray photoelectron spectroscopy is used to analyse systematically a group of La 1− x Sr x ‐based mixed‐metal perovskite‐type oxides of interest in the development of oxygen separation membranes. Angle‐ and temperature‐resolved studies reveal compositional variations that correlate with the segregation of various elements during annealing. The complex O 1s, Sr 3d 5/2 and La 3d 5/2 spectra could be curve‐fitted systematically with two La 3d 5/2 , three Sr 3d 5/2 and five O 1s contributions, respectively, using fixed binding energies and full widths at half‐maximum. The trends are discussed and assignments are made on the basis of peak intensity and composition variations noted during the angle‐ and temperature‐resolved studies, literature data and nearest‐neighbor electronegativities. In all cases, elements present at the outermost surface revealed higher binding energies than their bulk‐bound counterparts.
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P.A.W. van der Heide (2002) studied this question.
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