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Order-disorder in clay mineral structures

ISTO, CNRS-Université d’Orléans, 1A rue de la Férollerie, 45071 Orléans, Cedex 2, France

^* E-mail: Alain.Plancon{at}univ-orleans.fr

(Received 6 April 2000; revised 24 July 2000)

Some recent works dealing with the concept of order-disorder in clay minerals are considered, including those aspects of order-disorder which appeared in the Brindley & Brown (1980) monograph, i.e. disorder in the distribution of cations, disorder in layer stacking, order-disorder in mixed-layer systems and finite crystal size as a lattice disorder. Heterogeneity of samples and polymorphous transformations are also considered as other types of disorder. Most of these works emphasize that accurate structural characterization can only be obtained if several techniques are combined (e.g. XRD and IR, EXAFS and Mössbauer spectroscopies, etc.). Another conclusion is that accurate structural determination provides the key to the genesis of clays.

KEYWORDS: order, disorder, phyllosilicates, clay minerals, cation distribution, heterogeneity, mixed layer

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