Microstructural characterization and crystallization of (1−x)TeO2–xCdF2 (x=0.10, 0.15, 0.25mol) glasses

Role of molybdenum ions on physical, optical, electrical and vibrational studies in Er3+ co-doped TeO2–ZrO2–PbCl2 glasses

“…It is corresponding to the known [27] strong Raman band of crystalline ␣-TeO 2 at 646 cm −1 . The Raman bands at ∼720 and at ∼775 cm −1 are due to the formation of TeO 3+1 and/or TeO 3 pyramids associated with NBO in the glassy sample [3][4][5]12,28]. These two bands are assigned to stretching mode contributions from TeO 4 trigonal bipyramids tbps, TeO 3+␦ polyhedra and TeO 3 tps [24].…”

“…Several models associate this band to some structural length by R = V t /ω max , where ω max is the frequency of the maximum of the boson peak and V t is the velocity of the transverse sound wave propagating through the sample [23]. The band at 450 cm −1 is usually ascribed to bending vibrations of (Te-O-Te) linkages [3,[6][7][8][9], which are formed by vertex sharing of TeO 4 , TeO 3+1 and TeO 3 polyhedra, with increasing MoO 3 content, this band shifts towards lower frequency and its relative intensity increases as shown in Fig. 2.…”

“…Study on tellurite based glasses, has been the subject of high interest due to their potential applications such as IR domes which enlarges the transmission infrared spectra range up to 6 m, high refractive index, high phonon energy, and an excellent non-linear behavior [1][2][3][4][5][6][7][8][9]. These properties, due to the high polarizability of Te 4+ -ions (with a solitary electron pair 5s 2 ), can be even more enhanced by means of the incorporation of other heavy metals oxides that can be easily polarized (e.g.…”