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Raman Microprobe Spectroscopy of Halloysite

Published online by Cambridge University Press:  28 February 2024

R. L. Frost  and
H. F. Shurvell
R. L. Frost
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, Brisbane, Q 4001, Australia
H. F. Shurvell*
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, Brisbane, Q 4001, Australia
*
†Permanent address: Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6.
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Abstract

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The Raman spectra of a tubular halloysite originating from Matauri Bay, New Zealand, have been obtained using a Renishaw 1000 Raman microscope system. The Raman microprobe enables the Raman spectra of crystals as small as 0.8 μm diameter to be obtained over the complete wavelength range and allows spectral variations along the different crystal axes to be studied. Three bands in the hydroxyl stretching region were observed at 3616.5, 3623.4 and 3629.7 cm-1 and are attributed to the inner hydroxyls of the shared lower plane of the octahedral sheet of the halloysite. Two bands at 3698.2 and 3705 cm−1 were obtained for the outer hydroxyls of the unshared outer octahedral plane. The relative intensity of the 3629.7 cm−1 band varied according to the tube orientation. Lattice vibrations of the halloysite were also found to be orientation-dependent.

Keywords

HalloysiteKaoliniteLattice VibrationsRaman MicroprobeRaman Spectroscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 1 , February 1997 , pp. 68 - 72
Copyright
Copyright © 1997, The Clay Minerals Society

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