Optical bistability for ZnO–Nb2O5–TeO2 glasses

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

“…The spectrum of MnO free glasses has exhibited three conventional bands due to phosphate groups: (i) in the region 1090-1150 cm −1 due to (ν s -PO 2 mode), (ii) between 580 and 670 cm −1 due to (ν s -POP mode) and (iii) at about 280 cm −1 due to bending and torsional vibrations of PO 4 structural units [70]. Additionally, two significant bands (i) at about 910 cm −1 (assigned to vibrational mode of Nb-O terminal bond in [NbO 4 ] 2− units) [73] and (ii) at about 660 cm −1 (assigned to less distorted NbO 6 octahedra with no non-bridging oxygens) [74,75] have also been observed. With the gradual increase of MnO in the glass matrix, the bands due to ν s (PO 2 mode) and (POP mode) and [NbO 4 ] 2− units vibrations have been shifted towards lower wavenumber with increasing intensity.…”

Optical absorption and spectroscopic properties of thulium doped (TeO2)(Nb2O5)(TiO2) glasses

“…As dictated in many literatures, the pure TeO 2 does not show the glass structure with a melting temperature of 733 o C under traditional methods [9]. Contribution of Nb 2 O 5 , ZnO, and PbF 2 to TeO 2 would make the glass transparent in the infrared region [10][11][12][13]. Tellurite glasses that have been investigated in this study appear in yellowish or darkyellowish colour.…”

Waveguide fabrication in lithium-niobo-phosphate glasses by high repetition rate femtosecond laser: route to non-equilibrium material’s states

“…The bands at 600, 760 and 1100-1200 cm −1 are attributed to symmetric and asymmetric stretching vibrations of phosphorous tetrahedra units (-P-O-P-, (PO 2 ) bonds) [13,23,24]. Band at 910 cm −1 is connected with vibrational mode of Nb-O bond in [NbO 4 ] 2-units [25,26]. In this way the Raman spectroscopy allows to conclude that the studied glass has hybrid niobium-phosphate structure based on typical for phosphate glasses flexible -P-O-P-network with embedded Nb-based fragments.…”