The local structure around the vanadium site in the oriented V2O5⋅1.6 H2O 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 V2O5 hydrogel phase is derived.
Structure of Oriented V2O5 Gel Studied by Polarized X-Ray-Adsorption Spectroscopy at theVanadium K Edge
STIZZA, Sergio;MANCINI, Giorgio;
1989-01-01
Abstract
The local structure around the vanadium site in the oriented V2O5⋅1.6 H2O 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 V2O5 hydrogel phase is derived.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
