UV-IR spectra of new tellurite glasses

Binary tellurite glass systems of the forms TeO2(100 - x)-xA(n)O(m) where A(n)O(m) = La2O3 or V2O5 and x = 5 to 20 for La2O3 and 10 to 50 for V2O5 were prepared. UV-spectra of these glasses were recorded in the range of 200-700 nm at room temperature. The optical energy gaps E-optical and E-tail have been calculated from the optical absorption edge. UV cut-off and IR cut-off have been measured. Calculations of the oxide ion average polarizability (alpha(0)(2-)) and optical basicity (Lambda) have been done.