Structural investigations of the xTeO2–(1−x)GeO2 (x=0, 0.2, 0.4, 0.6, 0.8 and 1) tellurite glasses: A composition dependent Raman spectroscopic study

Structural, mechanical and optical investigations in the TeO2-rich part of the TeO2–GeO2–ZnO ternary glass system

“…%) has been already reported in ref [12]. In the present study, the GeO 2 content is limited only to 20 mol.…”

“…%, in order to study the effect of the addition of this oxide on the TeO 2 glass properties. In this work, room temperature Raman spectra are recorded for this binary and are found to be the same as reported earlier [12]. The addition of GeO 2 leads to a shift of the band near 450 cm -1 , responsible for the deformation of Te-O-Te linkages, towards higher frequencies (475 cm -1 ), and a decrease of the intensity of the band near 650 cm -1 relative to the stretching vibration of Te-O in TeO 4 entities.…”

“…The addition of GeO 2 leads to a shift of the band near 450 cm -1 , responsible for the deformation of Te-O-Te linkages, towards higher frequencies (475 cm -1 ), and a decrease of the intensity of the band near 650 cm -1 relative to the stretching vibration of Te-O in TeO 4 entities. We note also the appearance of a band in high frequency region located at about 840 cm -1 and it is assigned to the asymmetric stretching of GeO 4 tetrahedra in analogy with pure SiO 2 spectrum [12].…”

“…Recently, Monteiro et al reported that the introduction of Germanium oxide increases the working range (glass forming region and thermal stability point of view), as well as, the fiber-drawing ability of tellurite glasses [11]. Based on Raman spectroscopy data, a detailed structural study of xTeO 2 -(1-x)GeO 2 with (x= 0.2, 0.4, 0.6, 0.8 and 1) germanium tellurite glasses was reported and it was concluded that the network structure is formed by TeO 4 trigonal bipyramid, TeO 3 trigonal pyramid units and GeO 4 tetrahedral units, the evidence of the Te-O-Ge mixed linkages was not confirmed [12].…”

“…N (780 cm -1 ) Stretching Te-O (NBO) in TeO 4 polyhedra. Glass-forming domain at 850°C under ice-quenching conditions within the TeO 2 -GeO 2 -ZnO (TGZ) system in the TeO 2 -rich part ( : powder samples, compositions that led to bulk glasses used in this study are highlighted in the dashed rectangle, : glass compositions reported in the literature forTeO 2 -GeO 2 binary system[12]). The solid line indicates the limit of the glass forming domain.…”