Thermal, IR, Raman characteristics, Raman gain coefficient and bandwidths in quaternary glasses

Evaluation of the elastic properties of monovalent oxides using $$\hbox {TeO}_{2}$$ TeO 2 -based glasses

“…The values of ionicity calculated for the modifiers in our samples are shown in table 1. The values of TeO 3 /TeO 4 ratio were deduced from the Raman spectra of the samples, where the intensities of the IR major band at 650 cm −1 and of the band at 720 cm −1 were assigned to TeO 4 and TeO 3 units, respectively [35], and these values are listed in table 1. It can be noticed that the modifier TiO 2 has the lowest value of ionicity (I = 0.76), which corresponds to the lowest value of the TeO 3 /TeO 4 ratio (0.18) in sample 7, while the modifier Ag 2 O has the highest value of ionicity (I = 0.92), which corresponds to the highest value of the TeO 3 /TeO 4 ratio (0.63) in sample 4.…”

“…Molar volume (V a ), mean velocity (V m ), Debye temperature (θ D ), glass transition temperature (T g ), thermal stability T and IR major band position. [35].…”

Magento optical properties and structure of tellurite glasses modified by alkaline ions

“…As a result, the TeO 4 phase unit (tbp) is converted to TeO 3+1 and TeO 3 (tp) phases [30]. For symmetrical stretching or bending vibrations of Te-O-Te links [31,32] and symmetric stretching vibrations of the Zn-O bond in the ZnO 4 tetrahedral group [30,33], the band (a) in the spectral range 431-462 cm -1 has been determined. The antisymmetrical stretching of the continuous network formed of TeO 4 (tbp) trigonal bipyramidal units is specified by the band (b) that emerged in the range 582-592 cm1 [34,35,36].…”

“…For symmetrical stretching or bending vibrations of Te-O-Te links [31,32] and symmetric stretching vibrations of the Zn-O bond in the ZnO 4 tetrahedral group [30,33], the band (a) in the spectral range 431-462 cm -1 has been determined. The antisymmetrical stretching of the continuous network formed of TeO 4 (tbp) trigonal bipyramidal units is specified by the band (b) that emerged in the range 582-592 cm1 [34,35,36]. The symmetric stretching vibrations of tellurium and axial oxygen (Te) in Te qe O ax TeO 4 (tbp) units are attributed to the band (c) at 640-654 cm -1 [37,38].…”

“…The symmetric stretching vibrations of tellurium and axial oxygen (Te) in Te qe O ax TeO 4 (tbp) units are attributed to the band (c) at 640-654 cm -1 [37,38]. The stretching vibrations of TeO and Te=O bonds including nonbridging oxygen in TeO 3 (tp) phase were connected to the peak (d) in the range of 717-721 cm -1 [36]. Finally, stretching vibrations of TeO 3 /TeO 3+1 units are verified in the band designated (e) in the range 733-773 cm -1 [32,34,39,40].…”