Abstract
LiI–AgI–B 2O 3 glasses mixed with different concentrations of Fe 2O 3 (ranging from 0 to 2.0 mol%) were prepared. DC conductivity and dielectric properties over a range of temperature and also optical absorption and ESR spectral studies have been investigated. The optical absorption and ESR studies have indicated that iron ions do exist in both Fe 2+ and Fe 3+ states and the reduction ratio is the highest in the samples containing 0.9 mol% of Fe 2O 3. The analysis of the results of DC conductivity has indicated that T > θ D/2, the small polaron hopping model seems to be fit and the conduction is adiabatic in nature. These results further indicated that there is a mixed conduction (both ionic and electronic) and the ionic conduction seems to prevail over polaron hopping in the glasses containing Fe 2O 3 more than 0.9 mol% of Fe 2O 3. The variations of dielectric constant and loss with temperature have been analyzed on the basis of space charge polarization. The low temperature part of AC conductivity is explained based on the quantum mechanical tunneling model.
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