LAUSR

Abstract60B2O3-30Bi2O3-5TeO2-(5–x)Y2O3-xNd2O3 mole% (0 ≤ × ≤ 4) glasses were prepared by the usual experimental glass-melting procedures. This work was carried out to study the effect of Nd2O3 on the properties of the glasses studied and thereby their structure. The effect of the replacement of Y2O3 by Nd2O3 on the optical and electrical properties of the glass samples was studied. The results obtained showed that the values of density, oxygen packing density, concentration of Nd ions and field strength were found to increase with increase of the Nd2O3. On the other hand the molar volume, inter-nuclear distance and polaron radius showed the opposite behavior with increasing Nd2O3 content. The results also showed that the direct and indirect optical band gap were found to increase which indicate that increasing the concentration of Nd2O3 leads to a change in the structure of glasses induced by Nd2O3. Dc and ac conductivities values were found to increase, whereas the dc activation energy decreases, with increasing Nd2O3 concentration. An increase in the dielectric constant values with increasing Nd2O3 content is observed. The results suggest that the CBH model seems to be the appropriate model for the ac conductivity in the studied glasses.