Effects of Increasing Tungsten on Structural, Elastic and Optical Properties of xWO3-(40-x)Ag2O-60Te2O Glass System

doi:10.1016/j.jmst.2014.10.002

Abstract

Abstract: Ternary tellurite glasses with composition of xWO₃(40-x)Ag₂O-60TeO₂ (x = 0-40 mol%) have been prepared by melt-quenching method. Elastic and optical properties of the glass system were obtained by ultrasonic velocity measurements and UV-vis spectroscopy, respectively, while structural investigation was carried out by using Raman spectroscopy. The longitudinal and shear velocities, v_L and v_s showed large increase at x from 0 to 20 mol% before decrease with further addition of WO₃. Independent longitudinal modulus C_L and shear modulus μ bulk modulus K_e Young's modulus Y and Debye temperature θ_D showed similar behaviors to both velocities. The large increase of the elastic moduli at x from 0 to 20 mol% is suggested to be due to the increase in WO₆ octahedral unit structure indicating the increase of bridging oxygen (BO) and formation of stronger Te-O-W bonds compared to Te-O-Te bonds. On the other hand, for x > 20 mol%, the decrease in the elastic moduli was due to the increase of non-bridging oxygen (NBO) as a result of formation of WO₄ tetrahedral via breaking Te-O-W network. Further analysis by using bulk compression and ring deformation models showed a slight decrease in the ratio of ideal bulk modulus K_bc to the experimental bulk modulus K_e and average atomic ring size, l for x < 20 mol% followed by a large increase for x > 20 mol%. Our analysis also indicates that limited ring deformation took place and the main compression mechanism in this glass system was mainly ideal isotropic compression. On the other hand, optical band gap E_opt showed small variation for x = 0-20 mol% but decreased upon higher WO₃ content while refractive index n showed the opposite trend. This optical behavior is suggested to be related to the changes in cross link density and NBO concentration in the glass system.

Key words: Elastic moduli, Optical absorption, Raman spectroscopy, Tungsten-tellurite glasses, Ultrasonic velocity

M.M. Umair, A.K. Yahya, M.K. Halimah, H.A.A. Sidek. Effects of Increasing Tungsten on Structural, Elastic and Optical Properties of xWO₃-(40-x)Ag₂O-60Te₂O Glass System[J]. J. Mater. Sci. Technol., 2015, 31(1): 83-90.

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Effects of Increasing Tungsten on Structural, Elastic and Optical Properties of xWO₃-(40-x)Ag₂O-60Te₂O Glass System

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