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• W2007193075 endingPage "192" @default.
• W2007193075 startingPage "183" @default.
• W2007193075 abstract "The coordination and valence of niobium in TiO2NbO2 solid solutions, NbxTi1−xO2 (for 0.1 ≤ x ≤ 1.0), were studied by Nb K-edge X-ray absorption spectroscopy (XAS) as a function of Nb composition, x. Ten single-phase compositions in the NbxTi1−xO2 solid solution with the rutile structure were examined: x = 0.1, 0.2, 0.32, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0. Analysis of X-ray absorption near edge structure (XANES) data shows that the position of the preedge absorption shifts to higher energy with decreasing Nb concentration, indicating that the ratio of Nb5+ to Nb4+ is larger at low Nb concentrations than at high ones. The extended X-ray absorption fine structure (EXAFS) analysis indicates that the average NbO interatomic distance increases nearly linearly with increasing Nb concentration. This structural modification of the oxygen environment about niobium suggests that an increasing fraction of Nb ions (i.e., Nb5+) occupy tetrahedral interstitial sites with decreasing Nb composition." @default.
• W2007193075 created "2016-06-24" @default.
• W2007193075 creator A5022587578 @default.
• W2007193075 creator A5062365315 @default.
• W2007193075 creator A5083544762 @default.
• W2007193075 date "1991-07-01" @default.
• W2007193075 modified "2023-09-25" @default.
• W2007193075 title "Coordination and valence of niobium in TiO2NbO2 solid solutions through X-ray absorption spectroscopy" @default.
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• W2007193075 doi "https://doi.org/10.1016/0022-4596(91)90287-r" @default.
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