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Epitaxial growth of zeolite X on zeolite A and twinning in zeolite A: structural and topological analysis

Published online by Cambridge University Press:  25 June 2018

F. Porcher ,
Y. Dusausoy ,
M. Souhassou  and
C. Lecomte
F. Porcher*
Affiliation:
Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux, et Biologiques associé au C.N.R.S., U.P.R.E.S.A 7036, Université Henri Poincaré Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy cedex, France
Y. Dusausoy
Affiliation:
Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux, et Biologiques associé au C.N.R.S., U.P.R.E.S.A 7036, Université Henri Poincaré Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy cedex, France
M. Souhassou
Affiliation:
Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux, et Biologiques associé au C.N.R.S., U.P.R.E.S.A 7036, Université Henri Poincaré Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy cedex, France
C. Lecomte
Affiliation:
Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux, et Biologiques associé au C.N.R.S., U.P.R.E.S.A 7036, Université Henri Poincaré Nancy I, BP 239, 54506 Vandœuvre-lès-Nancy cedex, France
*
*E-mail: [email protected]
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Abstract

Synthesis of large zeolite A and X crystals by a modified Charnell’s method led to the formation of twinned zeolite NaA crystals, overgrowth of NaX onto NaA and co-crystallization of another phase analysed by electron microprobe as a Na aluminosilicate but not yet identified. Single crystals of NaA have a perfect cubic habit with a 100 μm edge. Twinned crystals of NaA are of the same size and correspond to an intergrowth of two cubes like that found in twinned fluorite crystals. NaX single crystals are octahedral, 220 μm along the [100] direction. Based on the difference in morphology of A and X crystals, epitaxial growth of NaX zeolite on NaA was also clearly identified by scanning electron micrographs. The object of this contribution is to provide topological and structural information on the twinning and epitaxy.

Keywords

zeoliteepitaxial growthCharnell’s methodtwinning
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 1 , February 2000 , pp. 1 - 8
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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