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Smectites including the iron-bearing smectites have proved difficult to measure using the techniques of Raman spectroscopy. The use of Fourier transform (FT)-Raman spectrometers using indium-gallium-arsenide
detectors has enabled the spectra of a selection of high iron-bearing smectites and nontronites to be measured. Low-intensity hydroxyl stretching Raman bands were found at 3436 and 3355cm -1 and are attributed
to the Fe-FeOH unit. Low-frequency bands were observed at around 201, 163, 128, and 90cm -1. The 90cm -1 band is ascribed to the stretching vibration of the hydrated cation. Bands observed at around 780
and 880cm -1 are ascribed to the hydroxyl deformation modes of the Fe-FeOH and Fe-AlOH. Index Headings: Ferruginous smectite; FT-Raman spectroscopy; Montmorillonite; Nontronite; Smectite.
The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)