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- W2008023183 abstract "The polycrystalline thin film of Bi 1− x Y x O 1.5 ( x = 0.3) has been prepared by r.f.-sputtering method and was annealed under various oxidation conditions for the introduction of excess oxygens. In Bi 0.7 Y 0.3 O 1.5+δ , as the preparation condition became oxidative, the band gap decreased from 3.0 to 2.1 eV, indicating the formation of Bi 5+ . In pseudo-perovskite crystal, BaBiO 3 thin film which was prepared for comparison, the intense and broad absorption band with the absorption coefficient of 10 5 cm −1 located at 2.2 eV was observed. The absorption bands observed in both oxides were ascribed to the charge transfer transitions from Bi 3+ 6 s 2 to Bi 5+ 6 s 0 . However, they had different intensities and energy positions. These transitions were classified into two types from the point of view of lattice vibration of anions between mixed-valence cations. In perovskite type in which ( BiO 6 2 ) octahedra are linked by sharing corner, the vibration of apical oxygens was expected to enhance the charge transfer transition." @default.
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- W2008023183 date "1997-12-01" @default.
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- W2008023183 title "Charge transfer band observed in bismuth mixed-valence oxides, Bi1−xYxO1.5+δ (x = 0.3)" @default.
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- W2008023183 doi "https://doi.org/10.1016/s0038-1098(97)00405-5" @default.
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