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• W1995536587 startingPage "3455" @default.
• W1995536587 abstract "We have examined the optical properties of Cr3+ in MgF2 and in the fluorite-structure hosts: CdF2, CaF2, SrF2, and BaF2. The properties of Cr3+ in MgF2 are similar to those observed for other fluoride crystals that have octahedral substitutional metal sites. Interestingly, Cr3+ is also found to be sixfold coordinated in the fluorite hosts, despite the fact that the metal sites of these crystal lattices are eightfold coordinated. The smaller ionic radius of Cr3+ compared to, say, Ca2+, undoubtedly results in considerable relaxation at the metal site. However, the crystal field stabilization energy present in the 4A2(d3) ground state also provides for the energetic preference of sixfold vs eightfold coordination. The similarity of the observed absorption spectra of Cr3+ in MgF2 and in fluorite give evidence that the ground state is octahedrally coordinated in all of these hosts. The reduction of this electronic stabilization energy in the 4T2(d3) excited state is considered to produce a configurational shift relative to the ground state. This shift may be the reason why Cr3+ luminesces effectively in MgF2 whereas it is largely quenched in the fluorite-structure materials." @default.
• W1995536587 created "2016-06-24" @default.
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• W1995536587 date "1987-03-15" @default.
• W1995536587 modified "2023-09-23" @default.
• W1995536587 title "Optical properties of Cr3+ in fluorite-structure hosts and in MgF*2" @default.
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• W1995536587 doi "https://doi.org/10.1063/1.452001" @default.
• W1995536587 hasPublicationYear "1987" @default.
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