Electrical conductivity and conductivity relaxation in glasses

Abstract

The electrical conductivity and the conductivity relaxation of the fluoride glasses in the system with LiF content ranging from 10 to 60 mol% have been investigated in the frequency range 10 Hz-2 MHz and in the temperature range from 300 K to just below the glass transition temperatures. The conductivity shows a minimum and the activation energy a maximum for 20 mol% LiF content, which is interpreted as a crossover from -dominated conductivity to -dominated conductivity at 20 mol% LiF. The glass decoupling index also shows a minimum for 20 mol% LiF, which is associated with the occurrence of the minimum for the conductivity. The conductivity relaxation parameter , however, shows a minimum for 30 mol% LiF. A structural origin has been proposed to account for this.