FTIR and XPS studies of bioactive silica based glasses

The effect of phosphate content on the bioactivity of soda-lime-phosphosilicate glasses

“…Serra et al saw this band shift to higher wavenumber with increasing silica, from 44 to 66 wt. %, in bioactive glass samples [19]. The band seen around 1200 cm -1 in the 21 day SBF samples is due to a component of the asymmetric stretching mode of Si-O [19,23,24].…”

“…For the glasses containing phosphate, in the 500 to 600 cm -1 region there is a broad feature corresponding to the P-O bending mode and also a Si-O-Si bending vibration in this region [13,[15][16][17]. Around 720 cm -1 in the glass spectra is the band due to Si-O bending vibrations [18,19]. The dominant bands at approximately 910 and 990 cm -1 can be attributed to Si-O (Q 2 ) and Si-O-Si stretching vibrations respectively [15,16].…”

Structure and Characterization of Some High Chemically Resistance Silicate Glasses

“…The bands at the 800 -1200 cm -1 are assigned to the stretching vibration of the SiO 4 tetrahedra with the different number of bridging oxygen atoms. Si-O-NBO (1 nonbridging oxygen per SiO 4 tetrahedron, corresponding to a Q 3 structure) situated in the range 890 -975 cm -1 [27]. According to that the bands presented at 940 and 1040 cm -1 are assigned to three-dimensional network structure i.e.…”

Rare-Earth Recovery from Soda Lime Silicate Glass Cullet by P2O5 Addition

“…5) correspond to vibrations of Si-O-Si and P-O-P linkages [31][32][33][34][35][36]. The IR spectrum for x = 15 mol% (A/Pratio = 1.62) shows intense bands at 918, 1050, and 1123 cm -1 , associated with stretching vibration of Si-O (Q 3 ), stretching vibration of Si-O-Si, and bending vibration of Si-O (Si-O-Si groups), respectively [31,32]. Three narrow bands peaking at 622, 796, and 1199 cm -1 are assigned to a cristobalite-like three-dimensional SiO 4 network [33,34].…”

“…Wavenumber (cm Table 3 [31,32] 1100 m as (Si-O-P) stretch [35,36] 1123 m as (Si-O), Si-O-Si groups [31,32] 1200-1260 m as (PO 2 ) stretch, Q 2 units [35,37] while 1 % of the total europium concentration could be recovered from the sample with 15 mol% P 2 O 5 addition (region B, Fig. 6).…”