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Routine identification of aluminium hydroxide polymorphs with the laser Raman microprobe

Published online by Cambridge University Press:  09 July 2018

K. A. Rodgers
K. A. Rodgers*
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
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Abstract

The laser Raman microprobe spectrum of gibbsite displays four intense v (OH)- stretching bands at ~3365, 3435, 3525 and 3618 cm-1, bayerite shows three near 3425, 3545 and 3564 cm-1, nordstrandite has three near 3492, 3566 and 3623 cm-1, and doyleite one broad band centred at -3545 cm-1 with sometimes a prominent shoulder near 3615 cm-1. The four polymorphs also possess distinctly different Raman signatures of medium to strong bands in the region 100–1200 cm-1. These differences provide a non-destructive routine determinative procedure by direct microsampling of untreated crystals, fragments, and microcrystalline powders. Sample preparation is minimal. Excessive noise and non-quenchable fluorescence are the principle limitations of the technique.

Information

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 1 , March 1993, pp. 85 - 99
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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