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Determination of the Ti speciation in commercial kaolins by Raman spectroscopy

Published online by Cambridge University Press:  09 July 2018

E. Murad  and
H. M. Köster
E. Murad
Affiliation:
Bayerisches Geologisches Landesamt, Concordiastrasse 28, D-96049 Bamberg
H. M. Köster
Affiliation:
Lehrstuhl für Angewandte Mineralogie und Geochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
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Abstract

Raman spectra of a selection of kaolins with widely varying TiO2 contents revealed the presence of anatase in 17 of 18 samples. A significant positive correlation was observed between the intensity of the main anatase Raman band at ~145 cm-1 and the total TiO2 contents of the kaolins as determined by chemical analysis. No TiO2 modification other than anatase was detected in any of the samples.

The determination of the anatase contents in kaolins by XRD becomes increasingly difficult as the concentration of this mineral decreases below ~0.5%. In contrast, anatase and brookite concentrations an order of magnitude lower can still be readily identified by Raman spectroscopy. The specificity and sensitivity of Raman spectroscopy for these TiO2 polymorphs, coupled with the simplicity and rapidity of measurement, therefore make this a viable technique for the routine study of these accessory minerals in kaolins.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 479 - 485
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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