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• W790802568 abstract "Optical and EPR measurements of CaF2 : Ni before and after X-irradiation are reported. An absorption band at 255 nm grows during X-irradiation. The thermal evolution of this band and some bleaching experiments in 15 K X-irradiated samples containing Vk centers indicate that the 255 nm band is due to Ni+ centers. Some EPR signals associated with the Ni+ centers are also observed. Low temperature measurements show that there are two slightly different kinds of centers one of them having tetragonal symmetry (g∥ = 2.569 ± 0.005, g⊥ = 2.089 ± 0.005) and the other one with about the same values of g∥ and g⊥ and a small rhombic distortion. Both signals show a superhyperfine structure due to interaction with four fluoride ions. The proposed model for the Ni+ center is a (NiF4)3- molecular ion formed by a Ni+ ion displaced toward one of the faces of the cube of fluorines. Another EPR signal showing cubic symmetry (g = 2.003) with a well resolved superhyperfine structure due to the interaction with eight equivalent fluorines is also observed in some irradiated samples. The proposed model for the center responsible of this signal is a Ni3+ center in a Ca2+ substitutional position." @default.
• W790802568 created "2016-06-24" @default.
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• W790802568 date "1980-07-01" @default.
• W790802568 modified "2023-10-15" @default.
• W790802568 title "IMPURITY CENTRES.Ni+ and Ni3+ centers in X-irradiated CaF2" @default.
• W790802568 doi "https://doi.org/10.1051/jphyscol:1980649" @default.
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