Structure of oriented V2O5 gel studied by polarized x-ray-absorption spectroscopy at the vanadium K edge.
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The local structure around the vanadium site in the oriented V{sub 2}O{sub 5}{center dot}1.6 H{sub 2}O dehydrated xerogel phase is investigated by polarized x-ray-absorption spectroscopy (XAS). A large dychroism is found both in the extended x-ray-absorption fine structure (EXAFS) and in x-ray-absorption near-edge structure (XANES). A joint analysis of EXAFS and XANES data is reported. EXAFS analysis has been performed using a spherical-wave propagator and XANES analysis by full multiple-scattering calculation. A detailed discussion about the origin of all the different features in the experimental XAS spectra and a method to extract small contributions in the EXAFS part of the spectrum is presented. Moreover, the local structure around the vanadium atom in the V{sub 2}O{sub 5} hydrogel phase is derived.