Structure of oriented V sub 2 O sub 5 gel studied by polarized x-ray-absorption spectroscopy at the vanadium K edge

Journal Article · Fri Dec 15 00:00:00 EST 1989 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.12229· OSTI ID:7246930

Stizza, S; Mancini, G ^[1]; Benfatto, M; Natoli, C R ^[2]; Garcia, J ^[3]; Bianconi, A ^[4]

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1. Dipartimento di Matematica e Fisica, Universita di Camerino, I-62032 Camerino, (Italy)
2. Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, I-00044 Frascati, (Italy)
3. Instituto de Ciencia de Materiales de Aragon, Consejo Superior de Investigaciones Cientificas, Universidad de Zaragoza, 50009 Zaragoza, (Spain)
4. Dipartimento di Fisica, Universita di Roma, La Sapienza,'' I-00185 Roma, (Italy)

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.

• OSTI ID: 7246930
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 40:18; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
VANADIUM OXIDES
CHEMICAL BONDS
ABSORPTION SPECTROSCOPY
DICHROISM
GELS
HYDRATES
MULTIPLE SCATTERING
ORIENTATION
POLARIZATION
PROPAGATOR
X RADIATION
CHALCOGENIDES
COLLOIDS
DISPERSIONS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SCATTERING
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies