Raman and infrared structural investigation of (PbO)_x(ZnO)_(0.6−x)(P₂O₅)_0.4 glasses

Abstract

The structure of ternary (PbO) x (ZnO) (0.6−x) (P 2 O 5 ) 0.4 glasses was investigated using Raman scattering and infrared spectroscopy over the compositional range x = 0-0.6. No significant change of the average chain length composed by PO 4 tetrahedral units with the substitution of zinc for the lead cation was observed. The linewidth and wavenumber variations of the Raman high-wavenumber bands reflect the Zn/Pb substitution in these glasses and are correlated with the metal-oxygen force constant and local disorder. The infrared reflectivity spectra have been fitted with the four-parameter dielectric function model. The variation in the 1000-1200 cm −1 wavenumber range has been attributed to an increase of the oscillator damping LO (PO 3 ) 2− as with PbO content vibrations rather than a variation of the chain length.

Structure and properties of gadolinium loaded calcium phosphate glasses

“…is attributed to the symmetric stretching vibration of PAOAP bonds occurring in ring type groups associated with Q 2 metaphosphate units [27,28]. The band located at $910 cm À1 is due to the asymmetric stretching vibration of PAO bonds in Q 2 units [29][30][31]. The band at 1110 cm À1 comes from asymmetric stretching modes of (PO 3 ) 2À group associated with Q 1 phosphate units and that band centered at $1275 cm À1 is given by the asymmetric stretching vibration of doubly bonded oxygen v as (P@O) and (PO 2 ) À modes from Q 2 units [29][30][31][32].…”

The white light emission properties of Tm 3+ /Tb 3+ /Sm 3+ triply doped SrO–ZnO–P 2 O 5 glass

“…The band located at~920 cm −1 is due to the asymmetric stretching vibration of P-O-P bonds in Q 2 units [20][21][22]. The band at~1110 cm −1 comes from asymmetric stretching modes of ν(PO 3 ) 2 − group associated with Q 1 phosphate units and that band centered at~1280 cm −1 is given by the asymmetric stretching vibration of doubly bonded oxygen ν as (P=O) and (PO 2 ) − modes from Q 2 units [20][21][22][23]. Fig.…”

Characterization of the disordered phosphate network in CaO–P2O5 glasses by 31P solid-state NMR and Raman spectroscopies

“…In the following, each mode will be denoted by its wavenumber in the lowest-Ca content glass. One can underline at this step that this dependence is much smaller than that of PbO x -ZnO 0.6 − x -P 2 O 5 glasses [28]. A typical fit of the VV-polarized Raman spectra from which the positions of the vibration bands were extracted is shown in Fig.…”

“…As recently shown, such information can be obtained more directly from throughbond DQ-SQ [31,32] and triple quantum-single quantum [33] (TQ-SQ) MAS NMR correlation experiments using the 2 J(P-O-P) isotropic indirect coupling. Raman scattering can also provide complementary insights about the chain length distribution in phosphate glasses through the behavior of specific vibrational modes [27,28].…”

“…The Q n distribution was experimentally determined for a number of binary phosphate glasses using from 31 P solid-state magic angle spinning (MAS) NMR experiments [14][15][16][17][18][19][20][21][22][23][24][25] or from the analysis of the stretching vibrations in Raman spectra [14,26,27], and also in ternary phosphate glasses [28]. For all of the studied ultraphosphate [14][15][16][17][18][19] (x b 0.5) and alkali polyphosphate [14,19,20] (x N 0.5) glasses, the Q n distribution is well described by the simple Van Wazer's model.…”