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| Wave number (cm−1) | Band assignment | Wave number (cm−1) | Band assignment |
|---|---|---|---|
| 465 | δ (Si-O-Si) bending | 1630 | δ (OH) |
| 595 | P-O of PO32− group | 2853 | −OH (water) |
| 784 | ν (Si-O-Si) tetrahedral | 2923 | ν (CH) |
| 1020 | ν (Si-O-Si) asymmetric | 3445 | ν (OH) |
