Abstract
The effect of thermal and mechanical treatment upon dielectric characteristics was investigated for NaCl crystals doped with divalent nickel. The behaviour of two ionic thermocurrent (ITC) bands was followed during room temperature (RT) storage of the pretreated samples. The isothermal annealing curves are of the t an − m type, with m characteristic of segregation of the impurities near dislocations accompanied by Ostwald ripening. The activation energy of this process is equal to the migration activation energy for cation vacancies in NaCl crystals, i.e., the migration of impurities is controlled by the diffusion of vacancies. Prolonged annealing of supersaturated solid solution (ST) samples at RT results in the appearance of a third ITC band, probably related to the formation of secondary-phase particles rich in cation vacancies.
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