Structural, Optical and Dielectric Properties of Tellurite Borate Glasses Doped with Cerium Oxide

Synthesis of tellurite borate (35-x) TeO2 + 35 B2O3 + 20 Bi2O3 + 10 Li2O + x CeO2 and x = 0, 0.5, 1.5, 3 mol (E_g^opt ) from 2.77 to 1.96 eV for direct allowed transitions and from 2.45 to 1.82 eV for indirect allowed transitions. It has also been studied how electrical conductivity and dielectric properties change with frequency and composition. Values ε′, ε″ and σac of sample with x = 0 are greater than those values of with x = 3. The variation of the imaginary part of the electric modulus (M″) versus frequency (F) plot curve is asymmetric of non-Lorentzian type. A shift of the frequency peak towards the higher frequency region was observed by increasing CeO2 mol