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Ga/Al substitutions in synthetic kaolinites and smectites

Published online by Cambridge University Press:  09 July 2018

F. Martin ,
S. Petit ,
A. Decarreau ,
Ph. Ildefonse ,
O. Grauby ,
D. Beziat ,
Ph. de Parseval  and
Y. Noack
F. Martin
Affiliation:
Université Paul Sabatier, Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse
S. Petit
Affiliation:
Université de Poitiers, Laboratoire 'Hydr.A.S.A.', URA 721 du CNRS, 40 Avenue du Recteur Pineau, F-86022 Poitiers Cedex
A. Decarreau
Affiliation:
Université de Poitiers, Laboratoire 'Hydr.A.S.A.', URA 721 du CNRS, 40 Avenue du Recteur Pineau, F-86022 Poitiers Cedex
Ph. Ildefonse
Affiliation:
Universités Paris 6 et 7, Laboratoire de Minéralogie-Cristallographie, CNRS 09 et IPGP, 4 Place Jussieu, F-75252 Paris Cedex 05
O. Grauby
Affiliation:
CRMC2-CNRS, Campus Luminy, Case 913, F-13288 Marseille Cedex 9
D. Beziat
Affiliation:
Université Paul Sabatier, Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse
Ph. de Parseval
Affiliation:
Université Paul Sabatier, Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse
Y. Noack
Affiliation:
Université d'Aix-Marseille III, Laboratoire de Géosciences de l'Environnement, CNRS FU 017, Europôle Méditerranden de l'Arbois, BP 80, F-13545 Aix en Provence Cedex 4, France
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Abstract

The Ga for A1 substitution in kaolinites and smectites was studied using clay synthesis from initial gels having an (Al + Ga)/Si ratio of kaolinites and MGa = Ga/(Ga + A1) ratio ranging from 0 to 1. Only kaolinite was obtained for MGa in the range 0-0.10. For higher MGa, synthesized clays were both kaolinite and beidellite, or pure beidellites. The evolution of b cell parameters, and the appearance of a vAI-OH-Ga absorption band at 3600 cm-1 in FFIR spectra, proves the progressive substitution of AI by Ga in kaolinite. The low substitution of AI by Ga in kaolinite can be correlated with the large difference in ionic radii between Al3+ and Ga3+ which causes a large increase in cell dimensions. By contrast, the incorporation of Ga in smectites is easy and can be complete.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 231 - 241
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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