Relationship Between Optical Basicity And Average Single Bond Strength Of Oxide Glasses

Average single bond strengths Bm-o in kJ/mol of an average metal-oxide ion (M-O) chemical bond have been estimated for La2O3-P2O5, Na2O-SiO2, PbO-SiO2, Na2O-GeO2 and R2O-TeO2 (R=Li, Na and K) glasses using single bond strength data for simple oxides. It has been found that the decrease in the Bm-o is accompanied with decrease of refractive index based interaction parameter A and O1s binding energy in XPS spectra, and an increase in the refractive index based optical basicity of the glasses. More acidic glasses possess large Bm-o which means participation of an average oxide ion in more covalent M-BO (bridging oxygen) bonds such as P-O, Si-O and Ge-O.