Abstract
Glasses with compositions 25Li 2O–(75− x)Bi 2O 3– x B 2O 3, with 0⩽ x⩽30 mol%, have been prepared using the melt quenching technique. The density and the molar volume have been determined. IR spectroscopy is used as a structural probe of the nearest neighbor environment in the glass network. The optical transmittance and reflectance spectrum of the glasses have been recorded in the wavelength range 400–1100 nm. The values of the optical band gap E g opt for indirect transition and refractive index have been determined for 0⩽ x⩽30 mol%. The average electronic polarizability of the oxide ion α o 2− and the optical basicity have been estimated from the calculated values of the refractive indices. Variations in the different physical parameters such as the density, molar volume, optical band gap, refractive index, average electronic polarizability of the oxide ion and optical basicity with B 2O 3 content have been analyzed and discussed in terms of the changes in the glass structure.
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