Abstract
The theoretical infrared (IR) and Raman spectra of bayerite (β-Al(OH)3) are computed in the density functional theory framework, using the linear response theory. The results are consistent with the occurrence of six non-equivalent OH groups in a bayerite structure with space group P21/n. Similar to gibbsite, the transmission powder IR spectrum of bayerite in the region of the OH stretching bands is found to depend on the shape of particles. In particular, the broadening of the strong band observed at about 3,460 cm−1 in the spectrum of Al hydroxides is related to the electrostatic charges occurring at the surface of the polarized dielectric particles. The experimental correlation observed between the shape of this band and morphological parameters has therefore a physical, instead of chemical, origin.
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Acknowledgments
We thank S. Borensztajn (LISE, University Paris VI) for the SEM observations. Calculations were performed at the IDRIS institute (Institut du Développement et des Ressources en Informatique Scientifique) of CNRS (Centre National de la Recherche Scientifique) within the project 060411519. This work has been supported by the French National Research Agency (ANR, projet “SPIRSE”) and CNRS-INSU through the ESF Eurocores program EuroMinSci (CRP “Hydromin”). This work is IPGP contribution 2321.
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Balan, E., Blanchard, M., Hochepied, JF. et al. Surface modes in the infrared spectrum of hydrous minerals: the OH stretching modes of bayerite. Phys Chem Minerals 35, 279–285 (2008). https://doi.org/10.1007/s00269-008-0221-y
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DOI: https://doi.org/10.1007/s00269-008-0221-y