Structural Investigation, Physical and Optical Properties of Mixed Alkali Bismuth Borate Glasses

In this paper lithium sodium bismuth borate glasses have been studied to obtain information about the mixed alkali effect. Powder XRD pattern confirmed the amorphous nature of all prepared glasses. The physical parameters and optical properties of all the glasses have been evaluated.DSC characterization has been carried out to determine the glass transition temperature, and the non-linear behavior of density, molar volume, glass transition temperature, direct and indirect optical band gaps and refractive index confirmed the mixed alkali effect. The FTIR analysis revealed that the network structure consists of BO3, BO4 units and BiO6 octahedral units and confirmed the absence of boroxyl rings in the prepared glasses. UV-vis spectroscopy showed no sharp absorption edges giving a clear indication of the amorphous nature of the glasses.