| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1618012 | Journal of Alloys and Compounds | 2010 | 8 Pages |
LiI–AgI–B2O3 glasses mixed with different concentrations of Fe2O3 (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 Fe2+ and Fe3+ states and the reduction ratio is the highest in the samples containing 0.9 mol% of Fe2O3. The analysis of the results of DC conductivity has indicated that T > θD/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 Fe2O3 more than 0.9 mol% of Fe2O3. 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.
Research highlightsLiI–AgI–B2O3 glasses mixed with different concentrations of Fe2O3 (ranging from 0 to 2.0 mol%) were prepared. DC conductivity and dielectric properties have been investigated. The analysis of these results (with the aid of the data on optical absorption and ESR studies) has indicated that there exists mixed conduction (both ionic and electronic) in these glasses; the investigation further indicated ionic conduction prevails over polaron hopping in the glasses containing more than 0.9 mol% of Fe2O3. The temperature independent part of AC conductivity is explained on the basis of quantum mechanical tunneling model.
