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Ga/Al substitutions in synthetic kaolinites and smectites

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The Ga for Al 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 + Al) 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 nuAl-OH-Ga absorption band at 3600 cm-1 in FTIR spectra, proves the progressive substitution of Al by Ga in kaolinite. The low substitution of Al 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.
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Document Type: Research Article

Affiliations: 1: Université Paul Sabatier, Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39Allées Jules Guesde, F-31000, Toulouse 2: *Université de Poitiers, Laboratoire ' Hydr. A .S.A.', URA 721 du CNRS, 40 Avenue du Recteur, Prineau, F-86022 Poitiers Cedex 3: CRMC2-CNRS, Campus Luminy, Case 913, F-13288 Marseille, Cedex 9

Publication date: 1998-06-01

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