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- W2183698493 abstract "In the present work, investigations of the structure of radiation induced defects have been performed in the BaF2:Cd, LiBaF3, LiYF4 crystals and in the oxyfluoride glass ceramics (OxFGC) by the electron paramagnetic resonance (EPR) spectroscopy techniques. Radiation defects in LiBaF3, LiYF4 crystals and in the OxFGC have been created using X-ray irradiation at room temperature (RT). The radiation defect in the BaF2:Cd crystal has been induced by γ-irradiation. Measurements of angular dependencies of EPR spectra and obtained EPR parameters let us to explain crystallographic structure of radiation induced defects in investigated materials. A perturbed EPR spectrum of the BaF2:Cd crystal has been explained with one nearest fluorine vacancy VF adjacent to the Cd impurity. In the LiBaF3 crystal of high purity, the F-type centre has been observed, which EPR spectrum allowed to clarify in more details the g-tensor components and hyperfine structure (hfs) constants ALi and AF due to electron interaction with its nearest lithium and fluorine nuclei. A proposed model of the radiation defect in LiYF4 crystal is a F-type center, where electron has hfs interaction with two nearest fluorine nuclei. Our calculations with following parameters: g‖ = 2.00, g⊥ = 1.975 and A = 27.85 MHz are in good agreement with experimental EPR spectra of this center. Observed hfs of the EPR spectra of a radiation defect in oxyfluoride glass ceramics has been explained with F-type center model in YF3 crystalline phase. It’s structure could be explained by an hfs interaction with it’s nearest 10 fluorine and 4 yttrium nuclei. Chapter" @default.
- W2183698493 created "2016-06-24" @default.
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- W2183698493 date "2008-01-01" @default.
- W2183698493 modified "2023-09-24" @default.
- W2183698493 title "EPR of Radiation Defects in Fluoride Crystals and in Oxyfluoride Glass Ceramics" @default.
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