Borosilicate glasses have been prepared using the high-temperature melt components of ingredients
Gd2O3 doped borosilicate glasses. FTIR spectra were measured in the wavenumber range (4000–
400 cm_1) to explore the state and influence of Gd3+ ions in the structure of the glasses. Data indicated
that B2O3 is acting as dual network formers (BO3) and (BO4) structural units whereas the gadolinium ions
playing the role of network modifier in these glasses. Optical transmission spectra were recorded in the
range 190–2500 nm and different optical parameters such as the direct and the indirect optical band gap,
Urbach energy, refractive index and optical dielectric constant, have been determined. The molar refraction,
electronic polarizability and the optical basicity results have been determined using the measured
glass refractive indices. Gadolinium-doped borosilicate glasses are found to be characterized by different
optical parameters.