The Garfield and Uley nontronites – An infrared spectroscopic comparison
Frost, Ray L. & Kloprogge, J. Theo (2002) The Garfield and Uley nontronites – An infrared spectroscopic comparison. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 58A(9), pp. 1881-1894.
FTIR and Infrared emission spectroscopy (IES) has been used to characterise the Uley (Australian) and Garfield nontronites. These clay minerals are characterised by a strong emission band at 3570 cm-1 attributed to the FeFeOH unit. Dehydroxylation is followed by the loss of intensity of this band as a function of temperature. Dehydroxylation is also followed by the loss of intensity of the FeFeOH deformation vibration at 843 cm-1. IES shows that the dehydroxylation occurs as a continuous process in comparison to DTA/TGA studies where the dehydroxylation occurs abruptly at 425 degrees Celsius. Water in these high iron bearing smectites have been observed through the stretching mode at 3430 cm-1 and the bending mode at 1630 cm-1. Different types of water are identified in the nontronite structure by the analysis of the band profile in the 1590 to 1680 cm-1 region. Low frequency vibrations show that the Uley green nontronite is similar to the Garfield nontronite. The brown Uley nontronite is closer to the Hohen-Hagen nontronite. The Uley nontronites may therefore be used spectroscopically to replace other nontronites as a reference clay mineral.
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|Item Type:||Journal Article|
|Keywords:||dehydroxylation, FT, IR, infrared emission spectroscopy, montmorillonite, nontronite, smectite|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2002 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||18 May 2005|
|Last Modified:||09 Jun 2010 22:24|
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