Hydroxyl-stretching bands in polarized micro-raman spectra of oriented single-crystal Keokuk kaolinite

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doi: 10.1346/000986002761002676
Authors:Shoval, S.; Yariv, S.; Michaelian, K. H.; Boudeulle, M.; Panczer, G.
Author Affiliations:Primary:
Open University of Israel, Department of Natural Sciences, Tel Aviv, Israel
Hebrew University of Jerusalem, Israel
CANMET Western Research Centre, Canada
Claude Bernard University, France
Volume Title:Clays and Clay Minerals
Source:Clays and Clay Minerals, 50(1), p.56-62. Publisher: Clay Minerals Society, Clarkson, NY, United States. ISSN: 0009-8604
Publication Date:2002
Note:In English. 24 refs.; illus., incl. 1 table
Summary:Polarized micro-Raman spectra of a single large crystal of Keokuk kaolinite were recorded in the OH-stretching region with the laser beam directed along the different crystal axes. The Raman spectra are characterized by five OH-stretching bands at 3694, 3683, 3668, 3650 and 3620 cm-1 labeled A, Z, B, C and D, respectively. The relative intensities of these five bands depend on the orientation of the crystal and the scattering geometry. The spectra agree with the assertion that bands A and Z arise from out-of-plane vibrations, whereas band D corresponds to an in-plane vibration. The area ratios of the various bands were calculated from fitted curves of spectra recorded with the electric vector of the laser beam parallel to different crystallographic planes. The increments in the relative areas of bands B and C were parallel to those of bands A and Z and it appears that out-of-plane vibrations made considerable contributions to these bands also. From the change of area ratios with the change in the direction of the electric vector of the laser beam, bands A and Z were attributed to LO and TO frequencies of one inner-surface hydroxyl vibration. Bands A+Z, B, C and D were attributed to the vibrations of the hydroxyls assigned by Bish (1993) as OH(3), OH(4), OH(2) and OH(1), respectively. These observations were supported by photoacoustic and transmission IR spectra. [R.A.H.]
Sections:Clay minerals
Subsections:Techniques; structure; properties
Subjects:Carboniferous; Clay mineralogy; Clay minerals; Crystal structure; Hydroxyl ion; Infrared spectra; Kaolinite; Keokuk Limestone; Lower Mississippian; Mississippian; Osagian; Paleozoic; Polarization; Raman spectra; SEM data; Sheet silicates; Silicates; Single-crystal method; Spectra
Abstract Numbers:03M/1262
Record ID:2002036656
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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