Abstract
Glasses having compositions 30 Li2O. 10 Bi2O3. (60−x) B2O3: x V2O5 with 0 < x < 10 mol % were prepared by normal melt quenching technique. The density, molar volume, glass transition temperature and optical properties of the prepared glasses have been investigated in order to understand the role of V2O5. The absorption edge, cut−off wavelength, optical band gap and Urbach energy were determined from the optical absorption spectra of the glass samples recorded at room temperature. The variations in optical band gap, density, glass transition temperature with V2O5 content have been discussed in terms of changes in the glass structure. The parameters such as average separation between transition metal ions and polaron radius have been calculated and employed to explain the concentration dependent physical and optical properties of the studied glasses.
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