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An X-ray photoelectron spectroscopy study of distinct series of niobia and silica-niobia mixed oxides, prepared via sol-gel at 1:2, 1:10 and 1:20 Nb/Si atomic ratios, is reported. The values of Nb 3d binding energy and the peak shapes for all the investigated samples exclude the presence of oxidation states other than Nb(V) at the surface. In the mixed oxides, the progressive Nb dilution in silica...
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