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- W3045692317 abstract "The exchange charge model of crystal field has been used to analyze the microscopic crystal field in the Al2O3:Ti3+ system. The effects of lattice relaxation upon doping were treated in the framework of density functional based calculations of the optimized geometry of the doped host. The optimized Al2O3:Ti3+ structure was used as an input for the calculations of distance dependence of the crystal field parameters and crystal field splittings of the Ti3+ 3d states. From these calculations, the constants of the electron-vibrational interaction and the Stokes shift between the absorption and emission spectra of Ti3+ ions in Al2O3:Ti3+ were estimated to yield good agreement with the experimental results. In addition, four parameters of the superposition model of the crystal field (which in general are considered as the fitting parameters) were extracted from the results of the exchange charge model calculations. The proposed method of linking together two independent models of the crystal field is a reliable way of calculating the superposition model parameters (rather than allowing them to vary freely) and can be readily applied to other systems." @default.
- W3045692317 created "2020-08-03" @default.
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- W3045692317 date "2020-12-01" @default.
- W3045692317 modified "2023-10-17" @default.
- W3045692317 title "An old system revisited: Al2O3:Ti3+ - Microscopic crystal field effects explored by the crystal field and first-principles calculations" @default.
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- W3045692317 doi "https://doi.org/10.1016/j.jallcom.2020.156459" @default.
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