Infrared Study of Structural OH in Kaolinite, Dickite, and Nacrite at 300 to 5 K
R. Prost, A. Damême, E. Huard, J. Driard, 1985. "Infrared Study of Structural OH in Kaolinite, Dickite, and Nacrite at 300 to 5 K", Proceedings of the International Clay Conference Denver, 1985, Leonard G. Schultz, H. van Olphen, Frederick A. Mumpton
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To obtain a better understanding of the structure of kaolin-group minerals, infrared spectra of structural OH in 1:1 dioctahedral clays were recorded as a function of temperature between 300 and 5 K. The low- and high-frequency components of the absorption bands of the structural OH groups shifted in opposite directions as the temperature changed and gave better resolution of the spectra. This behavior with temperature was used as a basis for assigning the stretching and bending modes of structural OH in the studied clays. Dichroic components, which are the result of coupling phenomena, were found at 3692, 3650, and 3644 cm-1 for kaolinite, dickite, and nacrite, respectively, and were attributed to vibrations of inner-surface OH groups which are, even in kaolinite, all nearly perpendicular to the sheet. The frequency and behavior with temperature of the corresponding decoupled OD groups indicate that inner-surface hydroxyls are involved in stronger hydrogen bonds in dickite than in kaolinite.
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Proceedings of the International Clay Conference Denver, 1985
The papers included in this proceedings volume are representative of the research on clays being conducted in all parts of the world at the time of publication. Many of the subjects treated are controversial, and although some ideas expressed may not necessarily represent the views of the editors, the referees, or the publisher, they deserve to be brought to the attention of the international clay community.