Optical properties and structure of B2O3 - BaO - V2O5 glasses
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2015-01-01
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Abstract
Glasses with compositions xB2O3.(35-x)BaO.65V2O5 (x = 1, 3, 5, 7, 10, 15 mol %) were prepared using a conventional melt quenching method. DTA and DSC analysis were performed. The theoretical refractive index, electronic oxide ion polarizability, optical basicity and optical band gap of the glasses were calculated by Lolrentz-Lorenz equation. The glasses were found to possess high refractive index (2.48 - 2.54), narrow band gap (2.54 - 2.71 eV), high oxide ion polarizability (2.41 - 2.70 Å3) and high optical basicity (1 - 1.05). The third order nonlinear optical susceptibility χ(3) was determined by generalized Miller's rule. It was established that χ(3) is close to the experimental value of 1.1x10-11 esu measured for thin film of V2O5 by Hashimoto et al. using THG method. The average single bond strength BM-O and interaction parameter A(no) were calculated. The bond strength was found to vary from 255 kJ mol-1 to 305 kJ/mol and interaction parameter was in the 0.05-0.07 Å-3 range, thus suggesting the presence of weak chemical bonds. Such bonds, namely Ba...O=V, V-NBO (nonbridging oxygen), V-O-B and V-O-V were confirmed by IR-spectra of the glasses. The high polarizability of the oxide ions in these bonds accounted for the observed linear and nonlinear optical properties of the glasses. A structural model of glasses containing BO3, B2O5, VO5 and VO4 groups is proposed.