Due to the high density and good transparency of Bi2O3-glasses, they are useful for radiation-shielding and scintillation counters [5]. Extended studies on the constitution of bismuth borate glasses [6–10] and bismuth silicate glasses
[11–13] by infrared, and Raman spectroscopy, have indicated that Bi3+ ions can participate both as network modifier and as network former in the form of pyramidal BiO3 and/or octahedral BiO6 units
and the ratio of each unit depends on the composition of the glass.