The structure of the kaolinite minerals−a FT-Raman study

Abstract The Fourier transform Raman spectra of the kaolinite minerals have been measured in the 50−3800 cm-1 region using near infrared spectroscopy. Kaolinites are characterized by remarkably intense bands in the 120−145 cm-1 region. These bands, attributed to the O−Si−O and O−Al−O symmetric bending modes, are both polymorph and orientation dependent. The 200−1200 cm-1 spectral range is a finger-print region for clay minerals and each kaolinite clay has its own characteristic spectrum. The structure of clays is fundamentally determined by the position of hydroxyl groups. Fourier-transform Raman spectroscopy readily enables the hydroxyl stretching region to be examined allowing identification of the component bands. The advantages of FT-Raman spectroscopy are shown to enhance the study of the kaolinite structure.

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