Spectroscopic Analysis of Lead Borate Systems

Oxide glass systems are, interesting because of their bonding like bridging and non -bridging oxygens. Depending on the modifier, the B2O3 glass system can have various Boron -Oxygen network. It is found that, MO modifies the borate network and increases the formation of penta and diborate groups. In this work, we investigated optical properties of lead Borate glass systems (x PbO: (1-x) B2O3) with x varying from 30 - 85 mol % using UV-VIS Spectra and the corresponding band gap was estimated using Tauc relation and these systems behave like direct allowed band gap systems. These results show that, E(g)decreases with the addition of lead content. Further the refractive index measurements also have been carried out at various wavelengths.Many correlation is found between the band gap and refractive index for different compositions. Using different theoretical models a best fit has been tried and Ravindra's relation is found to match with our experimental results