Network of new quaternary borate glasses Bi2O3–Y2O3–Al2O3–B2O3 was studied by FTIR and UV spectroscopies.
According to the FTIR results, the addition of Y2O3 increases the amount of bridging oxygens and changes the coordination
number of the glasses by creating [BO4] structural units. FTIR investigations explained the increase of
the computed elastic moduli according to Makishima–Mackenzie model. The optical parameters such as the UV
transmission, the polarizability, and the basicity are found to be sensitive to the concentration of Y2O3. The results
of the elastic moduli and the optical parameters were interpreted in terms of the vibrations of structural groups
and the strength of the bonds.