Hydroxyl-stretching bands ‘A’ and ‘Z’ in Raman and infrared spectra of kaolinites
- 1 December 1999
- journal article
- Published by Mineralogical Society in Clay Minerals
- Vol. 34 (4), 551-563
- https://doi.org/10.1180/000985599546442
Abstract
The high frequency OH-stretching band in micro-Raman spectra of kaolinites consistently exhibits two partly overlapping components with varying relative intensities. These bands, labelled A and Z, are located at ~3700–3690 and 3690–3680 cm-1, respectively. Band Z displays greater intensity in Raman spectra of highly crystallized kaolinites which have large coherent domains. Both components are also observed in the curve fitted infrared (IR) spectra of kaolinites; band Z is stronger in IR spectra of highly crystallized samples. Data for kaolinites with different particle size support the idea that bands A and Z are the longitudinal optic and transverse optic modes of the high frequency OH-stretching band.Keywords
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