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Hydroxyl-Stretching Bands in Curve-Fitted Micro-Raman, Photoacoustic and Transmission Infrared Spectra of Dickite from St. Claire, Pennsylvania

Published online by Cambridge University Press:  28 February 2024

S. Shoval ,
S. Yariv ,
K. H. Michaelian ,
M. Boudeulle  and
G. Panczer
S. Shoval*
Affiliation:
Geology Group, Department of Natural Sciences, The Open University of Israel, 16 Klausner St., 61392 Tel Aviv, Israel
S. Yariv
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
K. H. Michaelian
Affiliation:
Natural Resources Canada, CANMET Western Research Centre, Devon, Alberta, Canada T9G 1A8
M. Boudeulle
Affiliation:
LPCML, UMR 5620 CNRS, Claude Bernard University-Lyon 1, 43 Bd. 11 November 1918, 69622, Villeurbanne Cedex, France
G. Panczer
Affiliation:
LPCML, UMR 5620 CNRS, Claude Bernard University-Lyon 1, 43 Bd. 11 November 1918, 69622, Villeurbanne Cedex, France
*
E-mail of corresponding author: [email protected]
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Abstract

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The OH-stretching region in curve-fitted micro-Raman, photoacoustic and transmission IR spectra of St. Claire dickite was investigated. Polarized Raman spectra recorded from th. (001) an. (010) faces of the dickite crystal displayed six prominent OH bands. The relative intensities depend strongly on both the orientation of the crystallographic axes and the direction of the electric vector of the laser beam. Four out-of-plane vibrations, AA, Az, CA and Cz, at ~3710, 3706, 3654 and 3643 cm-1 respectively, predominate when the electric vector is perpendicular to the dickite plates. Two in-plane vibrations, Dz and DA at 3627 and 3623 cm-1, intensify when the electric vector is parallel to the plane. The relationship between band intensity and crystal orientation was interpreted in terms of longitudinal optic (LO) and transverse optic (TO) crystal vibration modes. These LO and TO crystal modes were also observed in curve-fitted photoacoustic and transmission IR spectra of coarse, non-oriented crystals of the dickite.

Keywords

Curve-fittingDickiteInfraredLO and TO Crystal ModesMicro-RamanOH bandsSEM
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 4 , August 2001 , pp. 347 - 354
Copyright
Copyright © 2001, The Clay Minerals Society

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