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Structure de l'espace interlamellaire de la vermiculite Mg bicouche

Published online by Cambridge University Press:  09 July 2018

J. F. Alcover
Affiliation:
Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, 1B, rue de la Férollerie, 45045 Orléans, France
L. Gatineau
Affiliation:
Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, 1B, rue de la Férollerie, 45045 Orléans, France

Résumé

L'étude des diffusions, en dehors des taches de Bragg, produites par les molécules d'eau et les cations échangeables des vermiculites magnésium bicouches (d001 ∼ 14·4 Å) permet de proposer un modèle de l'espace interlamellaire. Les groupements cation-molécules d'eau (Mg-12H2O) présentent une organisation bipériodique (maille centrée 3a,b) dans des domaines limités. Chaque motif est constitué par un octaèdre Mg-6H2O auquel est liée fortement une seconde ‘sphère’ d'hydratation, formée également par six molécules d'eau (distances entre atomes d'oxygène des deux sphères d'hydratation de l'ordre de 2·65 Å).

Abstract

Abstract

A model for the interlamellar space of Mg-vermiculite is proposed, based on the study of X-ray scattering between Bragg spots caused by H2O molecules and exchangeable cations. Groups of cation-water molecules, consisting of Mg-12H2O units, form a two-dimensional structure (centered cell 3a,b) in limited domains. Each group forms an octahedron (Mg-6H2O) which is strongly linked to a second hydration sphere of 6 H2O molecules; the distance between oxygen atoms of the two hydration spheres is ∼2·65 Å.

Kurzreferat

Kurzreferat

Diffusionsstuden, außerhalb der Bragg-Reflexe, wie sie von Wassermolekülen und den austauschbaren Kationen von Mg-Vermikuliten (d001 14·4 Å) entstehen, erlauben ein Modell des Zwischenschichtraumes zu entwerfen. Die Gruppierungen Kation-Wassermoleküle (Mg-12 H2O) ergeben eine biperiodische Anordnung (maille centrée 3a,b) innerhalb begrenzter Bereiche. Jedes Motiv wird durch ein Oktaeder aus Mg-6H2O gebildet mit dem eine zweite Hydratationssphäre eng verbunden ist, welche gleichermaßen durch 6 Wassermoleküle gebildet wird (Abstände zwischen Sauerstoffatomen der beiden Hydratationsbereiche etwa 2·65 Å).

Resumen

Resumen

Se propone un modelo del espacio interlamelar de vermiculita Mg basado en el estudio de la dispersión de los rayos X entre los puntos de Bragg causada por moléculas H2O y cationes intercambiables. Los grupos de moléculas catión-agua, consistentes en unidades Mg-12H2O, forman una estructura bidimensional (célula centrada 3a,b) en dominios limitados. Cada grupo forma un octaedro (Mg-6H2O) que está unido fuertemente a una segunda esfera de hidratación de 6 moléculas H2O; la distancia entre átomos de oxigeno de las dos esferas de hidratación es ∼2·65Å.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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References

Alcover, J.F., Gatineau, L & Merino, J (1973) Clays Clay Miner. 21, 131.CrossRefGoogle Scholar
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Mathieson, A & Walker, G.F. (1954) Am. Miner. 39, 231.Google Scholar
Merino, J (1949) Acta Cryst. 2, 371.CrossRefGoogle Scholar
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