Influence of intermediates on the optical and theoretical parameters of xLa2O3-(10-x) Y2O3 -15SrO-15CaO -10B2O3-10Al2O3-40SiO2 (2 ≤ x ≤ 8) glasses

In the present investigation, an attempt has been made to study the effect of La2O3/Y2O3 (X) ratio on the optical properties of the novel glass series xLa2O3-(10-x)Y2O3 -15SrO-15CaO -10B2O3-10Al2O3-40SiO2 (x = 2, 4, 6, 8). The glasses have been prepared via melt quenching route. Fourier transform infrared spectroscopy (FTIR) has been done to obtain the band positions and functional groups for all the pristine as well as heat treated glasses, respectively. UV-visible spectroscopy has been performed to obtain the band gap, Urbach energy and refractive indices for all the pristine as well as heat treated glasses. The parameters like density/molar volume have been calculated with the varying La2O3/Y2O3 (X) ratio. Also, some theoretical parameters like electronegativity of metal ion/oxide ion, interionic distance, ionic concentration, optical basicity and polarizability have been calculated. The parameters like average cross link density, average force stretching constant, bulk modulus and number of network bonds per unit volume have also been calculated. Furthermore, electron paramagnetic resonance (EPR) spectra have also been obtained for all the glass samples to determine the magnetic behavior as well as g values (spin Hamiltonian parameters). The optical basicity of all the glasses lies within the range of 0.621-0.631. All the pristine glasses exhibit band gap energy ranging from 5.80 to 5.89 eV.