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Investigation of Infrared and Raman Spectra of TeO_2-Nb_2O_5-TiO_2 Glasses

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Kabalci İ., Gökçe H.

Acta Physica Polonica A

2014

vol. 125

issue 4

877-881

X-ray diffraction, infrared (IR), Raman spectroscopy and scanning electron microscope techniques have been used to investigate the microstructural properties of the glass materials. In this work, a new type of tellurite based optical glasses with TeO_2/Nb_2O_5/TiO_2 for different xNb_2O_5 (x = 5, 10, 15, and 20 mol.%) glass compositions at constant 5 mol.% TiO_2 ratio were prepared. The effect of Nb_2O_5 contents on the structural unit of (95-x)TeO_2-(x)Nb_2O_5-5TiO_2 glass network, and the intensity ratios of the Raman peaks were investigated. The results indicate that for different Nb_2O_5 content 5 to 20 mol.% in the glass system, three vibrational peaks around 650, 800, and 920 cm^{-1} which correspond to the structural bonding of the glass were observed in the range of 500-2000 cm^{-1} for the IR spectra. Furthermore, from the Raman results a structural evolution was determined with the number of structural units such as [NbO_6]^{7-}, TeO_{3+1} (polyhedra), TeO_4 (trigonal bipyramids), TeO_3 (trigonal pyramids) or TeO_{3+1} (polyhedra), and [NbO_4]^{3-} for this ternary glass system.

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1 Acta Physica Polonica A

1 2014

1 Gökçe H.

1 Kabalci İ.

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Investigation of Infrared and Raman Spectra of TeO_2-Nb_2O_5-TiO_2 Glasses