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
1982-01-01
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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
