Comprehensive study of electronic polarizability and band gap of B2O3-Bi2O3-ZnO-SiO2 glass network

Quaternary glasses were successfully fabricated using melt quenching technique based on the chemical compound composition (x)Bi₂O₃-(0.5-x) ZnO-(0.2)B₂O₃-(0.3)SiO₂, where (x=0.1, 0.2, 0.3, 0.4, 0.45) mole. The sources of SiO₂ was produced from rice husk ash (RHA) at 99.36% of SiO₂. The Urbach energy was increased from 0.16eV to the 0.29eV as the mole of Bi₂O₃ increased in the glass structure. The indirect energy band gap is indicated in decrement pattern with 3.15eV towards 2.51eV. The results of Urbach energy and band gap energy that were obtained are due to the increment of Bi3+ ion in the glass network. The refractive indexes for the prepared glasses were evaluated at 2.36 to 2.54 based on the Lorentz-Lorentz formulation which correlated to the energy band gap. The calculated of molar polarizability, electronic polarizability and optical basicity exemplify fine complement to the Bi₂O₃ addition in the glass network. The glass sample was indicated in amorphous state.