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- W2061337296 abstract "The EPR and magnetic susceptibility data for xV2O5(1−x)[2B2O3·Li2O] glasses indicate the presence of both V4+ and V5+ valence states. The magnetic susceptibility investigation shows that only a small fraction of vanadium ions are in the V4+ state and the NV4+/NV5+ ratio decreases when V2O5 content increases. The EPR spectra recorded from samples with low V2O5 content (x≤5 mol%) show a well resolved hyperfine structure typical for isolated vanadyl ions in a ligand field of near octahedral (Oh) symmetry. For x>20 mol% the EPR spectra may be considered a superposition of two signals: one with a resolved hyperfine structure typical for isolated VO2+ ions in a C4v symmetry, and the other a broad line without structure, at g≈1.96, assigned to associated vanadium ions. The clustered ions are formed due to the dipole–dipole interactions between V4+ ions and their number increases with V2O5 content. At higher concentrations (x>20 mol%), V2O5 behaves as glass network former together with B2O3." @default.
- W2061337296 created "2016-06-24" @default.
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- W2061337296 date "2001-08-01" @default.
- W2061337296 modified "2023-10-16" @default.
- W2061337296 title "EPR and magnetic susceptibility investigations of some vanadate–lithium–borate glasses" @default.
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- W2061337296 doi "https://doi.org/10.1016/s0925-8388(01)01247-6" @default.
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