Vibrational spectroscopic study of the nitrate containing hydrotalcite mbobomkulite

Frost, Ray L. and Erickson, Kristy L. and Kloprogge, J. Theo (2005) Vibrational spectroscopic study of the nitrate containing hydrotalcite mbobomkulite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 61(13-14). pp. 2919-2925.

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DOI: 10.1016/j.saa.2004.11.002

Abstract

Raman spectroscopy has been used to study the nitrate hydrotalcite mbobomkulite NiAl2(OH)16(NO3).4H2O. Mbobomkulite along with hydrombobomkulite and sveite are known as ‘cave’ minerals as these hydrotalcites are only found in caves. Two types of nitrate anion are observed using Raman spectroscopy namely free or non-hydrogen bonded nitrate and nitrate hydrogen bonded to the interlayer water and to the ‘brucite-like’ hydroxyl surface. Two bands are observed in the Raman spectrum of Ni-Mbobomkulite at 3576 and 3647 cm-1 with an intensity ratio of 3.36/7.37 and are attributed to the Ni3OH and Al3OH stretching vibrations. The observation of multiple water stretching vibrations implies that there are different types of water present in the hydrotalcite structure. Such types of water would result from different hydrogen bond structures.

ID Code:	2089
Item Type:	Journal Article
Keywords:	mbobomkulite, stitchtite, iowaite, desautelsite, takovite, hydrotalcite, Raman spectroscopy
ISSN:	1386-1425
Divisions:	QUT Faculties and Divisions > Faculty of Science and Technology
Copyright Owner:	Copyright 2005 Elsevier
Copyright Statement:	Reproduced in accordance with the copyright policy of the publisher.
Deposited On:	11 Oct 2005
Last Modified:	23 Jan 2009 02:38

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