Ordre et désordre dans l'empilement des feuillets de phyllosilicates 2 : 1 hydratés

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Abstract
In hydrated 2 : 1 phyllosilicates, the layer stacking depends mainly on the ability of the interlayer space to induce, or not, long-or short-range order. One threedimensional order can be observed (in two water layer Ca-or Na-vermiculite) when peculiar water polyedra maintain the ditrigonal cavities facing each other. The other hydrated vermiculites tend to adopt semi-random stackings : two (sometimes three) energetically equivalent arrangements of adjacent layers are encountered, at random. A disordered layer stacking can be obtained if the interlayer space is unable to complete a defined anchoring of the layers towards each other. Generally speaking, the layer stacking disorder increases when the interlayer cation or water molecule number decreases, and when negative charge is delocalized on the layer surface.

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