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

Abstract

Quaternary glasses were successfully fabricated using melt quenching technique based on the chemical compound composition ([Formula: see text])Bi2O3–([Formula: see text]) ZnO–(0.2)B2O3–(0.3)SiO2, where ([Formula: see text], 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 0.16[Formula: see text]eV to the 0.29[Formula: see text]eV as the mole of Bi2O3 increased in the glass structure. The indirect energy band gap is indicated in decrement pattern with 3.15[Formula: see text]eV towards 2.51[Formula: see text]eV. The results of Urbach energy and band gap energy that were obtained are due to the increment of Bi[Formula: see text] 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.