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- W2094531264 abstract "The local structure around iron ions in the Bi2O3Fe2O3 glasses prepared by the twin-roller quenching method has been examined by means of ESR and Mössbauer measurements. It has been observed that the isomer shift of iron ions increases monotonically with the content of Fe2O3. This behavior indicates that as the content of Fe2O3 increases, the covalency of FeO decreases. The effective g-value of the ESR spectra of Fe3+ is slightly larger than 2.00 for all of the glasses. It is considered that this fact is attributable to the effect of the 6p orbital of Bi3+ and the dipolar interactions between Fe3+ ions. The distribution function of the electric field gradient around iron ions has been evaluated by fitting the calculated curve into the experimental Mössbauer spectrum. The average value of the electric field gradient estimated from the distribution function increases with increasing the content of Fe2O3. Namely, the coordination sphere of O2− around Fe3+ is more asymmetric in the glass with higher content of Fe2O3. From this result, it is considered that the magnitude of overlap between the 2p orbital of O2− and the 4s orbital of Fe3+ decreases with increasing content of Fe2O3, which is consistent with the compositional dependence of the isomer shift." @default.
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- W2094531264 date "1989-06-01" @default.
- W2094531264 modified "2023-10-18" @default.
- W2094531264 title "ESR and Mössbauer studies of Bi2O3Fe2O3 glasses" @default.
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- W2094531264 doi "https://doi.org/10.1016/0022-3093(89)90042-2" @default.
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