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Electrical conductivity and conductivity relaxation in glasses

1998; IOP Publishing; Volume: 10; Issue: 47 Linguagem: Inglês

10.1088/0953-8984/10/47/009

1361-648X

M. Sural, A. Ghosh,

Solid-state spectroscopy and crystallography

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.