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- W2077886773 abstract "Optical reflectivity and magneto-optical polar Kerr effect measurements in the photon energy ranges from 0.006 to 12 eV and 0.5 to 5 eV, respectively, are reported for magnetite and for Li and Mg ferrites. The diagonal and off-diagonal elements of the dielectric tensor are derived. From a comparison of the experimental results with the cation distribution formulae of the materials the excitations occurring below 2 eV can be assigned to transitions from Fe 2+ in octahedral sites and the excitation at about 3.9 eV to Fe 3+ in tetrahedral sites. Energy level schemes are deduced and are supported by a model describing the shape and the sign of the various magneto-optical transitions. In this model 3d n to 3d n-1 4s orbital promotion processes for the three kinds of iron ions are considered. Above 5 eV oxygen 2 p band to iron 4 s band charge-transfer transitions are shown to be responsible for the very strong optical absorption." @default.
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- W2077886773 date "1983-11-10" @default.
- W2077886773 modified "2023-10-09" @default.
- W2077886773 title "Evidence for 3d<sup>n</sup>to 3d<sup>n-1</sup>4s transitions in magnetite and in lithium and magnesium ferrites" @default.
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- W2077886773 doi "https://doi.org/10.1088/0022-3719/16/31/019" @default.
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