Raman spectroscopy of kaolinites using different excitation wavelengths

Frost, Ray L., Fredericks, Peter M., Kloprogge, J. Theo, & Hope, Greg (2001) Raman spectroscopy of kaolinites using different excitation wavelengths. Journal of Raman Spectroscopy, 32(8), pp. 657-663.

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Abstract

The Raman spectra of both low- and high-defect kaolinites in the hydroxyl stretching and low-wavenumber region were obtained with excitation at three visible wavelengths of 633, 514 and 442 nm and a UV wavelength of 325 nm. The UV-excited spectra were comparable to those excited by the visible wavelengths. The Raman spectra show hydroxyl stretching bands at 3621 cm-1 attributed to the inner hydroxyl, at 3692 and 3684 cm-1 attributed to the longitudinal and transverse optic modes of the inner surface hydroxyls and at 3668 and 3653 cm-1 assigned to the out-of phase vibrations of the inner surface hydroxyls. Two bands were observed in the spectral profile at 3695 cm-1 for the high-defect kaolinite at 3698 and 3691 cm-1 and were assigned to TO/LO splitting. An increase in relative intensity of the transverse optic mode is observed with decrease in laser wavelength. The intensity of the out-of-phase vibrations at 3668 and 3653 cm-1 of the inner surface hydroxyls shows a linear relationship with the longitudinal and transverse optic modes. In the low-wavenumber region excellent correlation was found between the experimentally determined and the calculated band positions.

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ID Code: 23810
Item Type: Journal Article
Refereed: Yes
DOI: 10.1002/jrs.722
ISSN: 0377-0486
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2001 John Wiley and Sons
Deposited On: 17 Jun 2009 14:09
Last Modified: 10 Aug 2011 14:44

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