Raman spectroscopic studies of TeO2-BaO-SrO-Nb2O5 glasses: Structure-property correlations

The structure of technologically important tellurite glasses has been studied by Raman spectroscopy. The present investigation revealed the presence of TeO4 trigonal bipyramid, TeO3 trigonal pyramid, and NbO6 octahedra in these glasses. The influence of a gradual addition of the modifier oxides on the glass structure has been elucidated. The evolution of TeO3 units with the modifier addition was different from the earlier reports on the tellurite glasses. Even at higher modifier concentrations TeO4 units were dominating in the glass network compared to TeO3, though NbO6 octahedra also come into the picture. The ratio of TeO4∕TeO3 structural units was discussed for different series of glass compositions. An attempt has been made based on these structural details obtained via Raman studies to explain the origin of the greatly improved thermal stabilities and refractive indices of these glass compositions.

[1]  H. G. Kim,et al.  Formation of Rb-doped crystalline phase with second harmonic generation in transparent K2O-Nb2O5-TeO2 glass ceramics , 1996 .

[2]  E. Fargin,et al.  Determination of Local Geometries around Tellurium in TeO2–Nb2O5and TeO2–Al2O3Oxide Glasses by XANES and EXAFS: Investigation of Electronic Properties of Evidenced Oxygen Clusters byAb InitioCalculations , 1996 .

[3]  T. Sekiya,et al.  Raman spectra of MO1/2TeO2 (M = Li, Na, K, Rb, Cs and Tl) glasses , 1992 .

[4]  S. Sakka,et al.  Coordination state of Nb5+ ions in silicate and gallate glasses as studied by Raman spectroscopy , 1988 .

[5]  A Mori,et al.  Gain characteristics of tellurite-based erbium-doped fiber amplifiers for 1.5-microm broadband amplification. , 1998, Optics letters.

[6]  T. Sekiya,et al.  Raman spectra of MOTeO2 (M = Mg, Sr, Ba and Zn) glasses , 1994 .

[7]  Y. Nishida,et al.  Gain-flattened tellurite-based EDFA with a flat amplification bandwidth of 76 nm , 1998, IEEE Photonics Technology Letters.

[8]  T. Sekiya,et al.  Normal Vibrations of Two Polymorphic forms of TeO2 Crystals and Assignments of Raman Peaks of Pure TeO2 Glass , 1989 .

[9]  Gao Huanxin,et al.  Properties and structure of niobosilicate glasses , 1989 .

[10]  S. Sakka,et al.  Structure of alkali or alkaline earth niobium gallate glasses , 1989 .

[11]  Michel J. F. Digonnet,et al.  Rare earth doped fiber lasers and amplifiers , 1993 .

[12]  M. Shimizu,et al.  Ultra-wide-band tellurite-based fiber Raman amplifier , 2003 .

[13]  T. Sekiya,et al.  Raman spectra of binary tellurite glasses containing tri- or tetra-valent cations , 1995 .

[14]  Lionel Canioni,et al.  Nonlinear optical properties of some tellurium (IV) oxide glasses , 1994 .

[15]  Douglas H. Blackburn,et al.  Optical properties of Nd3+ in tellurite and phosphotellurite glasses , 1981 .

[16]  L. S. Wall,et al.  Temperature study of the polarized Raman spectra of strontium barium niobate , 1973 .

[17]  A. P. Sokolov,et al.  The nature of boson peak in Raman scattering in glasses , 1986 .