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Raman and mid-IR spectroscopic study of the magnesium carbonate minerals– brugnatellite and coalingite

Frost, Ray L. & Bahfenne, Silmarilly (2009) Raman and mid-IR spectroscopic study of the magnesium carbonate minerals– brugnatellite and coalingite. Journal of Raman Spectroscopy, 40(4), pp. 360-365.

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Abstract

Two hydrated hydroxy magnesium carbonate minerals brugnatellite and coalingite with a hydrotalcite-like structure have been studied by Raman spectroscopy. Intense bands are observed at 1094 cm-1 for brugnatellite and at 1093 cm-1 for coalingite attributed CO32- ν1 symmetric stretching mode. Additional low intensity bands are observed at 1064 cm-1. The existence of two symmetric stretching modes is accounted for in terms of different anion structural arrangements.
Very low intensity bands at 1377 and 1451 cm-1 is observed for brugnatellite and the Raman spectrum of coalingite displays two bands at 1420 and 1465 cm-1 attributed to the (CO3)2- ν3 antisymmetric stretching modes. Very low intensity bands at 792 cm-1 for brugnatellite and 797 cm-1 for coalingite are assigned to the CO32- out-of-plane bend (ν2).
X-ray diffraction studies by other researchers have shown these minerals are disordered. This is reflected in the difficulty of obtaining Raman spectra of reasonable quality and explains why the Raman spectra of these minerals have not been previously or sufficiently described. A comparison is made with the Raman spectra of other hydrated magnesium carbonate minerals.

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ID Code: 19592
Item Type: Journal Article
Additional URLs:
Keywords: Sequestration of greenhouse gases; Magnesium Carbonate; (CO3)2- ; brugnatellite, coalingite, artinite; dypingite; Raman spectroscopy
DOI: 10.1002/jrs.2110
ISSN: 0377-0486
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 John Wiley & Sons
Deposited On: 16 Apr 2009 12:48
Last Modified: 01 Mar 2012 00:07

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