Abstract
The ratio of concentrations of nearcluster and conventional color centers increases in magnesium fluoride nanocrystals when prepared samples are maintained for some time before irradiation at a temperature higher than the temperature for mobility of the anion vacancies. Such pre-irradiation treatment of lithium fluoride nanocrystals leads to the formation of near-cluster aggregation of color centers during radiation exposure of the samples. Differences in the preirradiation temperature regimes of the samples affect the kinetics of the growth of the concentration of aggregate nearcluster centers in the post-radiation period. Conclusions are drawn concerning the mechanism and processes of nanocluster formation in the samples as well as the defects involved in their formation.
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