SYNTHESIS, POLARIZABILITY APPROACH AND STRUCTURE OF TeO2-BaO-V2O5GLASSES
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2020-01-01
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Abstract
Glasses with compositions xTeO2 - (35-x) BaO - 65V2O5 (where x = 5, 10, 15, 20, 25 and 30 mol %) were prepared using a conventional melt quenching method. Densities of the glasses at room temperature were determined with the Archimedes method. The theoretical linear refractive index and optical band gap of the glasses were calculated by the Lorentz-Lorenz equation. The glasses possess high refractive index (2.16 - 2.19) and comparatively narrow band gap (3.9 - 4.1 eV). The third order nonlinear optical susceptibility χ(3) was determined by generalized Miller’s rule. It was established that χ(3) equal to 0.72 - 0.85x10-12 esu is close to the experimental value of ~10-12 esu measured for pure TeO2 glass and TeO2 containing glasses by other authors using THG method. The refractive index and third order nonlinear optical susceptibility decrease and band gap increases with increasing TeO2 content. The average single bond strength BM-O and the interaction parameter A of the glasses were calculated. It was shown that BM-O is in the 258 - 295 kJ/mol range and A is in the 0.050 - 0.055 À-3 range suggesting for the presence of week chemical bonds. VO5, VO4 and TeO3 structural units were confirmed by the IR spectra and structural models of the glasses containing Ba…O-V, V-O-V and V-O-Te bonds were proposed. The oxide ions in these bonds possess high polarizability giving main contribution to the high values of linear and nonlinear optical properties of the glasses