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Characterization of smectite and illite by FTIR spectroscopy of interlayer NH4+ cations

Published online by Cambridge University Press:  09 July 2018

J . Pironon ,
M. Pelletier ,
P. De Donato  and
R. Mosser-Ruck
J . Pironon*
Affiliation:
UMR G2R, Université Henri Poincaré, BP 239, 54506 Vandoeuvre-lès-Nancy, France
M. Pelletier
Affiliation:
Laboratoire Environnement et Minéralurgie, INPL-CNRS UMR 7569, BP 40, 54501, Vandoeuvre-lès-Nancy, France
P. De Donato
Affiliation:
Laboratoire Environnement et Minéralurgie, INPL-CNRS UMR 7569, BP 40, 54501, Vandoeuvre-lès-Nancy, France
R. Mosser-Ruck
Affiliation:
UMR G2R, Université Henri Poincaré, BP 239, 54506 Vandoeuvre-lès-Nancy, France
*
*E-mail: [email protected]
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Abstract

FTIR spectroscopy has been applied to NH4+-exchanged dioctahedral clay minerals to determine the molecular environment of NH4+ and to quantify N concentration. FTIR under vapourpressure control, coupled with heating and freezing treatments has shown that NH4+ ion symmetry varies with the nature of clay minerals. NH4+ has a perfect tetrahedral symmetry in hydrated or dehydrated smectites and belongs to the Td symmetry group. The NH4+-bending vibration is centred at 1450 and 1425 cm–1.

The Si4+-Al3+ substitution in dioctahedral clay minerals induces the loss of symmetry elements of the NH4+ tetrahedron which acquires a C2v symmetry. As a consequence, the Td –C2v transition can be used to characterize the smectite–illite transition. Quantification of NH4+ content per half unit cell is provided by nNH4 = k[NH4]/[OH] where [NH4]/[OH] is the band area ratio of the NH4+-bending vibration to the OH-stretching vibration. k = 1.1 for hydrated smectite, 0.9 for dehydrated smectite and 0.8 for illite or tobelite. The bending vibration of NH4+ is chosen for the calculation because it is not affected by superimposed contributions.

Keywords

ammoniumsmectiteillitetobeliteIR spectroscopyhydration
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 2 , June 2003 , pp. 201 - 211
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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