Research Article
Geopolymers Based on Phosphoric Acid and Illito-Kaolinitic Clay
Table 3
The principal IR bands and their corresponding species of raw and calcined clay.
| Medenine clay | Calcined Medenine clay | Wavenumber (cm−1) | Corresponding species | Wavenumber (cm−1) | Corresponding species |
| 3656, 3698 | Hydroxyl groups (OH) of kaolinite | — | — | 3624 | Hydroxyl groups OH of illite | 3624 | Al-OH of illite | 3434 | OH of water | — | — | 1648 | H-O-H of water | — | — | 1000, 1036, 1005 | Si-O | 1034 | Si-O | 470 | Si-O | 480 | Si-O | 789, 778 | Doublet of quartz | 789, 778 | Doublet of quartz | 536, 754 | -OSi, -OSi of illite and kaolinite | — | — | 694 | Si-O-Si of quartz | 694 | Si-O-Si of quartz | 912 | Al-OH of kaolinite | — | — |
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