Polarizability and optical basicity of Er³⁺ ions doped zinc lithium bismuth borate glasses

Glass of the system: (25-x) Bi₂O₃:20Li₂O:20ZnO:35B₂O₃: xEr₂O₃. (Where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by X-ray diffraction studies. The physical parameters like density, reflection loss, electronic polarizability, optical basicity, oxide ions polarizability have been evaluated. Refractive index, electronic polarizability varies with increasing mole% of Er₂O₃ respectively. The theoretical value of average electronic polarizability and oxide ion polarizability were calculated by using lorentz-lorentz formula. Theoretical optical basicity of the glasses is also evaluated based on equation proposed by Duffy and Ingram. The metallization criterion has been calculated on the basis of refractive index and energy gap. The large value of metallization criterion indicates that the glass materials are insulators. (author)