Interpretation of XPS O (1s) in Mixed Oxides Proved on Mixed Perovskite Crystals

Abstract

Mixed perovskites (AA′)(BB′)O 3 , where A ) La or Nd, A′ ) Sr, B ) Al or Ga, and B′ ) Ta or Nb, were investigated by X-ray photoelectron spectroscopy (XPS). The interpretation of XPS O(1s) signals in mixed oxides is discussed. The nonsingular O(1s) peak that occurs in the mixed oxides is due to the polarization of the oxygen valence electron density, as was already proposed by us for Y 3 Al 5 O 12 and YAlO 3 . This interpretation seems to be true also for the case when four different metals are in the oxide. The O(1s) binding energies seem to depend on the direction in which they are ejected.

Luminescence Enhancement Mechanism of Lanthanide-Doped Hybrid Nanostructures Decorated by Silver Nanocrystals

“…The O 1s binding energy shifts for Ag NP-decorated samples are observed to shift from 532.6 to 532.2 eV (Fig. 4c), likely caused by the partial substitution of Si-O-Si and Si-O-H bonds with Si-O-Ag bonds, since it is known that species with increasing ionic character tend to lower the binding energies of the framework elements [36], which also agrees with the FTIR results.…”

New Extra Large Pore Chromium Oxophenylphosphate: An Efficient Catalyst in Liquid Phase Partial Oxidation Reactions

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The iron oxidation state in Mg–Al–Fe mixed oxides derived from layered double hydroxides: An XPS study

“…The often ignored Fermi level shifting due to the oxygen vacancy defect concentration and final state effects contribute to the interpretation problems for many metal oxides [15]. These difficulties are also present for mixed oxides, where the situation becomes even more complicated since even the interpretation of the BE shifts of the O 1s XP line is controversial for such compounds [16].…”

“…In the case of a pronounced polarization of its valence electronic shell, as in e.g. Ga oxides, the O 1s signal may have a more complicated, non-singular character [16]. In this case the ''splitting''-based estimation can become difficult.…”