Correlation between structure and optical basicity of glasses in the TeO2-V2O5-MoO3 system

Abstract Four series of glasses in the TeO2-V2O5-MoO3 system were prepared using a conventional melt-quenching method. The polarizability approach was applied to the glasses with the aim to estimate the electronic polarizability, optical basicity, and theoretical refractive index. The structure of the glasses was also investigated taking into consideration the chemical bonding, mutual influence of the oxides, and the role of the group optical basicity of the constituting structural species on the position of the IR absorption bands. An increase of the free volume and nonbridging oxygens was observed with the addition of V2O5, while the introduction of MoO3 lead to the formation of a more cross-linkage network depending on the glass-formation oxide. The main structural units in the glasses were found to be VO5 trigonal bipyramids, tbp's, of (VO4)n3n− chain and (V2O8)n zig-zag chain, MoO5 tbp's from [Mo2O8] complexes, TeO4 tbp's, TeO3+1 tbp's, along with TeO3 trigonal pyramids, tp's.