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Mecanisme de passage de l'etat hydrate a une couche a l'etat ‘zero couche’ d'une vermiculite-Li de Santa-Olalla

Published online by Cambridge University Press:  09 July 2018

C. H. Pons
Affiliation:
Laboratoire de Cristallographie, U.A. 810, Université d'Orleans, B.P. 6759, Rue de Chartres, 45067 Orléans Cédex, France
A. Pozzuoli
Affiliation:
Dipartamento di Geofisica e Vulcanologia dell'Università di Napoli, Largo S. Marcellino 10, 80138 Napoli, Italia
J. A. Rausell-Colom
Affiliation:
Instituto de Ciencias de Materiales, CSIC Sede C, Serrano 115 dpdo, 28006 Madrid, Espagne
C. De La Calle
Affiliation:
Instituto de Ciencias de Materiales, CSIC, Sede D, Serrano 113, 28006 Madrid, Espagne

Résumé

Par diffraction des Rayons X sur la vermiculite-Li de Santa-Olalla, il a été montré en fonction de la température qu'il existait différentes phases homogènes (d 001 = 12·17 Å, T = 25°C; d 001 = 12·02 Å, T = 60°C; d 001 = 11·89 Å, T = 70°C; d 001 = 10·04 Å, T = 100°C). Par ailleurs, pendant le processus de déshydratation entre les phases homogènes à 11·89 Å et 10·04 Å, il a été mis en évidence l'apparition d'états inhomogènes (interstratifiés). L'utilisation parallèle des méthodes directes d'étude des diagrammes de rayons X par transformée de Fourier monodimentionnelle pour les phases homogènes et d'une méthode indirecte de modélisation pour les états interstratifiés a permis de montrer que le passage de la phase 11·89 Å à la phase 10·04 Å se fait conjointement par une ségrégation de ces phases et un interstratifié aléatoire (11·89–10·04). Ce travail a en outre montré que la caractérisation des états intermédiaires entre phases homogènes ne peut être faite sans une étude structurale préalable des phases homogènes.

Abstract

Abstract

It has been shown by X-ray diffraction that there are several homogenous phases of the Santa Ollala Li-vermiculite, depending on the temperature (d 001 = 12·17 Å, T = 25°C; d 001 = 12·02 Å, T = 60°C; d 001 = 11·89 Å, T = 70°C; d 001 = 10·04 Å, T = 100°C). During dehydration of the 11·89 Å phase to the 10·04 Å phase, it is possible to observe heterogeneous (interstratified) states. By using a direct method involving a one-dimensional electron-density projection on to the Z-axis for the homogeneous phases, and an indirect method in which the observed intensities for the (00l) reflections were compared to the calculated intensities for a model interstratified structure, it has been demonstrated that the transformation of the 11·89 Å phase to the 10·04 Å phase occurs by a segregation between these phases and a random interstratification (11·89–10·04). It has also been shown that characterization of the intermediate states between the homogeneous phases could not be attained without prior study of the homogeneous phases.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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Mecanisme de passage de l'etat hydrate a une couche a l'etat ‘zero couche’ d'une vermiculite-Li de Santa-Olalla
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