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Integration of Fe in natural and synthetic Al-pyrophyllites: an infrared spectroscopic study

Published online by Cambridge University Press:  09 July 2018

S. Lantenois ,
J.-M. Beny ,
F. Muller  and
R. Champallier
S. Lantenois*
Affiliation:
Institut des Sciences de la Terre d'Orléans (ISTO), CNRS – Université d'Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France Institut Charles Gerhardt (ICG-AIME), CNRS – Université Montpellier 2, Bât 15 – Case courrier 015, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
J.-M. Beny
Affiliation:
Institut des Sciences de la Terre d'Orléans (ISTO), CNRS – Université d'Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France
F. Muller
Affiliation:
Institut des Sciences de la Terre d'Orléans (ISTO), CNRS – Université d'Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France
R. Champallier
Affiliation:
Institut des Sciences de la Terre d'Orléans (ISTO), CNRS – Université d'Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France
*
*E-mail: [email protected]
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Abstract

Numerous studies focus on the relationships between chemical composition and OH-band positions in the infrared (IR) spectra of micaceous minerals. These studies are based on the coexistence, in dioctahedral micas or smectites, of several cationic pairs around the hydroxyl group which each produce a characteristic band in the IR spectrum. The aim of this work is to obtain the wavenumber values of the IR OH vibration bands of the (Al-Fe3+)-OH and (Fe3+-Fe3+)-OH local cationic environments of ‘pyrophyllite type’ in order to prove, disprove or modify a model of dioctahedral phyllosilicate OH-stretching band decomposition. Natural samples are characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Raman spectroscopies and electron microprobe; the hydrothermal synthesis products are also analysed by powder XRD and FTIR after inductively coupled plasma measurements to obtain the chemical compositions of starting gel phases. Natural samples contain some impurities which were eliminated after acid treatment; nevertheless, a small Fe content is found in the pyrophyllite structure. The amount of Fe which is incorporated within the pyrophyllite structure is much more important for the synthetic samples than for the natural ones. The IR OH bands were clearly observed in both natural and synthetic pyrophyllites and assigned to hydroxides bonded to (Al-Al), (Al-Fe) and (Fe-Fe) cationic pairs. During this study, three samples were analysed by DTG to check the cis- or trans-vacant character of the layers and to determine the influence of this structural character on the OH-stretching band position in IR spectroscopy.

Keywords

pyrophyllitehydrothermal synthesesFTIR spectroscopyFe defaultscis-trans-vacant
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 1 , March 2007 , pp. 129 - 141
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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