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Raman Spectroscopy of Nontronites

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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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702001949483

Publication date: March 1, 2000

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