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Influence of KBr conditioning on the infrared hydroxyl-stretching region of saponites

  • M. Pelletier (a1), L. J. Michot (a1), O. Barrès (a1), B. Humbert (a2), S. Petit (a3) and J.-L. Robert (a4)...


In order to assess the influence of tetrahedral sheet charge on the hydroxyl-stretching vibration in clay minerals, a series of synthetic Na-saponites, with increasing layer charge, was studied by infrared (IR) spectroscopy. When recorded after KBr dilution either in transmission or diffuse reflectance, the IR spectra exhibit a component at ~3710 cm-1, the intensity of which increases linearly with increasing layer charge. When experiments are carried out without any dilution of the samples, this component is not observed, suggesting a Na+/K+ exchange upon mixing of the sample with KBr. The spectra obtained for K-saponite confirm this exchange. This shows that the dilution procedure can lead to serious misinterpretations of IR spectra in the OH-stretching region.



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Influence of KBr conditioning on the infrared hydroxyl-stretching region of saponites

  • M. Pelletier (a1), L. J. Michot (a1), O. Barrès (a1), B. Humbert (a2), S. Petit (a3) and J.-L. Robert (a4)...


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