Abstract
Electrical conductivity and dielectric properties have been studied for the glass system CaOB 2O 3Al 2O 3 in the temperature range 40–200°C. The substitution of 5% B 2O 3 by CaO or replacing 5% CaO by Na 2O or MgO cause a decrease in the conductivity, but the decrease obtained by soda is greater than that of magnesia. The activation energies of the tested glasses were calculated. All the glasses investigated showed a dielectric constant almost independent of temperature at fixed frequency. The effect of subjecting the glass to a constant dose of gamma-rays changes both the electrical conductivity and dielectric constant. The experimental results were discussed in relation to the specific conduction mechanism in such glasses. Also the effect of varying glass composition or temperature on the mobility or migration of current carrier was considered. The possible creation of induced defects in glass on irradiation was evaluated.
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