SEM, EDS and vibrational spectroscopic study of dawsonite NaAl(CO3)(OH)2

Frost, Ray L., López, Andrés, Scholz, Ricardo, Sampaio, Ney Pinheiro, & de Oliveira, Fernando A.N. (2015) SEM, EDS and vibrational spectroscopic study of dawsonite NaAl(CO3)(OH)2. Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy, 136(Part B), pp. 918-923.

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In this work we have studied the mineral dawsonite by using a combination of scanning electron microscopy with EDS and vibrational spectroscopy. Single crystals show an acicular habitus forming aggregates with a rosette shape. The chemical analysis shows a phase composed of C, Al, and Na. Two distinct Raman bands at 1091 and 1068 cm-1 are assigned to the CO32- ν1 symmetric stretching mode. Multiple bands are observed in both the Raman and infrared spectra in the antisymmetric stretching and bending regions showing that the symmetry of the carbonate anion is reduced and in all probability the carbonate anions are not equivalent in the dawsonite structure. Multiple OH deformation vibrations centred upon 950 cm-1 in both the Raman and infrared spectra show that the OH units in the dawsonite structure are non-equivalent. Raman bands observed at 3250, 3283 and 3295 cm-1 are assigned to OH stretching vibrations. The position of these bands indicates strong hydrogen bonding of the OH units in the dawsonite structure. The formation of the mineral dawsonite has the potential to offer a mechanism for the geosequestration of greenhouse gases.

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ID Code: 78923
Item Type: Journal Article
Refereed: Yes
Keywords: Dawsonite, Carbonate, Hydroxyl, Infrared and Raman spectroscopy
DOI: 10.1016/j.saa.2014.09.114
ISSN: 13861425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier B.V.
Copyright Statement: This is the author’s version of a work that was accepted for publication in Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy, [VOL 136(Part B) (2015)] DOI: 10.1016/j.saa.2014.09.114
Deposited On: 25 Nov 2014 23:30
Last Modified: 17 Aug 2016 13:32

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