Dielectric Studies on Alkali Borate Glasses Mixed with Iron Oxide

Abstract

Glass system of composition Li2O-Na2O-B2O3: Fe2O3with replacing alkali oxides one by another have been prepared via melt quenching. Further, the samples were characterized by X-ray diffraction. XRD studies have indicated that the prepared samples were amorphous in nature. Dielectric properties (constant ε , loss tan δ, a.c. conductivity σacover a wide range of frequency and temperature) of these glasses have also been explored. The activation energy for ac conduction is estimated to be the lowest for glass F25and the highest for glass F0. Finally the study on dielectric properties indicated that the ac conduction is predominantly ionic in nature in the samples containing high content of Li2O.Keywords:Borate glasses; dielectric properties; alkali effect

Theoretical study of selenium and tellurium impurities in (ZnO)6 clusters using DFT and TDDFT

“…Zinc oxide (ZnO) is one of these interesting metal oxide‐based semiconductors. As a biocompatible and biosafe material, it is very suitable for sensor/transducer applications . ZnO is a widely studied material due to its large band gap (3.3 eV), big exciton binding energy (60 meV), and low lasing threshold.…”