Hydroxyl-stretching bands in curve-fitted micro-Raman, photoacoustic and transmission infrared spectra of dickite from St. Claire, Pennsylvania

被引:16
作者
Shoval, S
Yariv, S
Michaelian, KH
Boudeulle, M
Panczer, G
机构
[1] Open Univ, Dept Nat Sci, Geol Grp, IL-61392 Tel Aviv, Israel
[2] Hebrew Univ Jerusalem, Dept Inorgan & Analyt Chem, IL-91904 Jerusalem, Israel
[3] Nat Resources Canada, CANMET, Western Res Ctr, Devon, AB T9G 1A8, Canada
[4] Univ Lyon 1, LPCML, UMR 5620 CNRS, F-69622 Villeurbanne, France
关键词
curve-fitting; dickite; infrared; LO and TO crystal modes; micro-Raman; OH bands; SEM;
D O I
10.1346/CCMN.2001.0490408
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 the (001) and (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, A(A), A(Z), C-A and C-Z, at similar to 3710, 3706, 3654 and 3643 cm(-1) respectively, predominate when the electric vector is perpendicular to the dickite plates. Two in-plane vibrations, D-Z and D-A 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.
引用
收藏
页码:347 / 354
页数:8
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