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The Garfield and Uley nontronites : an infrared spectroscopic comparison

By Ray L. Frost and J. Theo Kloprogge

Abstract

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

Topics: 030200 INORGANIC CHEMISTRY, dehydroxylation, FT, IR, infrared emission spectroscopy, montmorillonite, nontronite, smectite
Publisher: Elsevier
Year: 2002
DOI identifier: 10.1016/S1386-1425(01)00638-2
OAI identifier: oai:eprints.qut.edu.au:1080

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