European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 33, issue 2
Articles | Volume 33, issue 2
https://doi.org/10.5194/ejm-33-209-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-33-209-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 33, issue 2
Research article
 | 
23 Apr 2021
Research article |  | 23 Apr 2021

Local mode interpretation of the OH overtone spectrum of 1:1 phyllosilicates

Etienne Balan, Emmanuel Fritsch, Farid Juillot, Thierry Allard, and Sabine Petit

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Short summary
The OH overtone bands of kaolinite- and serpentine-group minerals observed in their near-infrared (NIR) spectra are widely used but their relation to stretching modes involving coupled OH groups is uncertain. Here, we map a molecular model of harmonically coupled anharmonic oscillators on the spectroscopic properties of 1:1 phyllosilicates. This makes it possible to interpret most of the observed bands and support the assignment of some of them to cationic substitutions in serpentines.
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