The X-ray Absorption Near-Edge Structure (XANES) of V in vanadium-iron glasses (50P2O5 + (50-x)FeO + xV2O5) have been measured. The effective charge of V ions in glasses has been determined. At low V2O5 concentration (x ∼ 5) only V4+ with 6-fold coordination is present on the contrary a static mixed valence state (V4+, V5+) has been found at high concentrations 20≤x≤50. The results explain the electron hopping conductivity effects at high V2O5 concentration (x ∼ 50) involving V4+ - V5+ pairs and at low V2O5 concentration (x≅10) involving V4+ - Fe3+ pairs.

Xanes (X-ray absorption near edge structure) of V in vanadium-iron phosphate glasses

PALLADINO, Libero
1982

Abstract

The X-ray Absorption Near-Edge Structure (XANES) of V in vanadium-iron glasses (50P2O5 + (50-x)FeO + xV2O5) have been measured. The effective charge of V ions in glasses has been determined. At low V2O5 concentration (x ∼ 5) only V4+ with 6-fold coordination is present on the contrary a static mixed valence state (V4+, V5+) has been found at high concentrations 20≤x≤50. The results explain the electron hopping conductivity effects at high V2O5 concentration (x ∼ 50) involving V4+ - V5+ pairs and at low V2O5 concentration (x≅10) involving V4+ - Fe3+ pairs.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11697/11384
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