A Raman and infrared spectroscopic study of the sulphate mineral aluminite Al2(SO4)(OH)4·7H2O

Frost, Ray L., López, Andrés, Scholz, Ricardo, & Wang, Lina (2015) A Raman and infrared spectroscopic study of the sulphate mineral aluminite Al2(SO4)(OH)4·7H2O. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 148, pp. 232-236.

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The mineral aluminite has been studied using a number of techniques, including scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDX) and Raman and infrared spectroscopy. Raman spectroscopy identifies multiple sulphate symmetric stretching modes in line with the three sulphate crystallographically different sites. Raman spectroscopy also identifies a low intensity band at 1069 cm-1 which may be attributed to a carbonate symmetric stretching mode, indicating the presence of thaumasite. The observation of multiple bands in this ν4 spectral region offers evidence for the reduction in symmetry of the sulphate anion from Td to C2v or even lower symmetry. The Raman band at 3588 cm-1 is assigned to the OH unit stretching vibration and the broad feature at around 3439 cm-1 to water stretching bands. Water stretching vibrations are observed at 3157, 3294, 3378 and 3439 cm-1. Vibrational spectroscopy enables an assessment of the molecular structure of aluminite to be made.

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ID Code: 84506
Item Type: Journal Article
Refereed: Yes
Keywords: Aluminite, Sulphate, Hydroxyls, Water of hydration, Raman spectroscopy, Infrared spectroscopy
DOI: 10.1016/j.saa.2015.04.011
ISSN: 1386-1425
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier
Copyright Statement: This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Deposited On: 27 May 2015 00:11
Last Modified: 02 Sep 2016 06:57

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