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- W1974169545 startingPage "4594" @default.
- W1974169545 abstract "Single crystals of LiCl containing 140 ppm ${mathrm{Fe}}^{2+}$ exhibit after x irradiation at 77 K ESR signals attributed to ${mathrm{Fe}}^{+}$ centers. Designated ${mathrm{Fe}}^{+}$${mathrm{v}}_{mathrm{c}}$(NN), ${mathrm{Fe}}^{+}$${mathrm{v}}_{mathrm{c}}$(NNN), and ${mathrm{Fe}}^{+}$, they are identified with respectively a substitutional ${mathrm{Fe}}^{+}$ ion perturbed by a nearest- and a next-nearest-neighbor cation vacancy and an isolated ${mathrm{Fe}}^{+}$ ion without any near defect. Simultaneous thermal decay of the first two types, present in a 5:1 ratio, occurs between 120 and 150 K as the perturbing vacancy moves away. A corresponding increase in the concentration of ${mathrm{Fe}}^{+}$ centers with the perturbing vacancy located farther away, and finally of unperturbed ${mathrm{Fe}}^{+}$, is observed. An activation energy of 0.46 eV for the free movement of the cation vacancy in LiCl is estimated. The crystal-field theory of Tinkham and the point-charge approximation is successfully applied to the noncubic ${mathrm{Fe}}^{+}$ centers in LiCl:Fe, NaCl:Fe, and NaF:Fe. The presence of other ESR lines, tentatively attributed to ${mathrm{Fe}}^{+}$ ions perturbed by near silicon ions, incorporated in the lattice during the crystal growth, is reported. No ${mathrm{Fe}}^{+}$ centers were observed in KCl:Fe and RbCl:Fe crystals." @default.
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- W1974169545 date "1987-04-01" @default.
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- W1974169545 title "Electron-trapped centers in x-irradiated LiCl:Fe crystals" @default.
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- W1974169545 doi "https://doi.org/10.1103/physrevb.35.4594" @default.
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