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Studies of the process of electret charge generation in LiF crystals subjected to mechanical activation and evaluation of the role of color centers in this process were carried out. Accumulation of currents in the studied material in absence of external voltage is connected with electrical activity of the system and the generation of a stable internal electric field in this system. The electric field generated in a heterogeneous medium formed by fine-dispersed lithium fluoride and a water film, causes ionization of polar water molecules that produce conductivity channels. This leads to active electrical interaction of the surfaces of solid and liquid dielectrics included in structure of the system under study. The presence of radiation induced defects in the dispersed phase based on LiF influences the processes of interphase interactions. This contributes to formation of deep electron traps and increases the lifetime of the charge of electrets. [ABSTRACT FROM AUTHOR]

Studies of the photoluminescence spectra of γ-irradiated lithium fluoride crystals during temperature annealing in the temperature range from 50 to 490°C were conducted. Experimental data show that F2 and F3+ color centers decay at different rates as temperature increases. The transformation of the F2 and F3+ centers is accelerated by action of laser radiation on γ-irradiated LiF crystals during annealing. [ABSTRACT FROM AUTHOR]

We present results of studies of formation mechanism of luminescence centers of the blue range in lithium fluoride crystals. We found that the centers under study are intrinsic defects of crystal lattice formed as a result of a radiation-thermal process in the temperature range much higher than room temperature. Experimental confirmation of simultaneous formation of these centers and F3+ centers, the increase in their concentration during thermal destruction of F3+ centers, and absence of the phonon structure characteristic of R2 centers give basis to attribute the considered centers to a stable configuration of intrinsic radiation defects constituting isomer of F3 center. [ABSTRACT FROM AUTHOR]