Order-disorder in clay mineral structures

Clay Minerals - Tập 36 Số 1 - Trang 1-14 - 2001
A. Plançon1
1ISTO, CNRS-Université d'Orléans. 1A, rue de la Férollerie 45071 Orléans Cedex 2, France

Tóm tắt

AbstractSome 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, orderdisorder 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 Mo¨ssbauer spectroscopies, etc.). Another conclusion is that accurate structural determination provides the key to the genesis of clays.

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