Electrical Conductivity of X-Irradiated NaCl

Measurement of the Stored Energy in X-Rayed Sodium Chloride

“…The number at each point is the number of the run (in chronological order). The solid straight line is obtained by a weighted least-squares fit of the "regular" runs, numbers 26,28,29,30,31,32 stored energy between the two regions would be the thermal energy for production of these vacancies. There does not seem to be evidence as to whether such vacancies, at room temperature, are of the nature of Frenkel defects, Schottky defects, or clusters of some sort.…”

Ionic conductivity and stored energy in gamma-irradiated NaF

“…So, the slope in region II gives the cation-vacancy migration energy (E m ) while the activation energy in region III is equal to E m plus half the dipole binding energy (E b ). It has been shown that ionizing irradiation induces a decrease in the ionic conductivity of these materials [4][5][6][7][8][9][10] between room temperature and 600 • C. The generation of some type of damage, which inhibits the impurity-cation-vacancy dipole dissociation, has been found to be responsible for this effect in KCl and NaCl [7,10]. On the other hand, storedenergy and ionic thermocurrent measurements have led to the conclusion that divacancy clusters and dislocations are created by ionizing irradiation [11][12][13]; these defects are closely related to the radiation-induced effects on the ionic conductivity of these alkali halides.…”

The effect of gamma radiation on the conductivity of sodium chloride

“…The presence of interstitials due to irradiation has been reported in optical absorption studies foUovjing irradiations at liquid helium temperature for samples examined at liquid helium temperature. Observation and anion vacancies in the volume surrounding these subgrains and defects are assumed to be the source of the blocked conductivity, an increase in blocked conductivity could be due to the increase in anion vacancy concentration as the radiation induced vacancies diffuse to these de fects (59,60). The decrease in activation energy with increasing radia tion dose is probably due to the higher concentration of radiation in duced anion vacancies existing in the crystal at lower tenperatui'es due to the lower anion vacancy diffusion rate at lower temperatures.…”