Intergrowth segregation in FAU-EMT zeolite materials

M. M.J. Treacy; D. E.W. Vaughan; K. G. Strohmaier; J. M. Newsam

doi:10.1098/rspa.1996.0041

Intergrowth segregation in FAU-EMT zeolite materials

M. M.J. Treacy, D. E.W. Vaughan, K. G. Strohmaier, J. M. Newsam

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

Intergrowths of cubic (FAU) and hexagonal (EMT) structural phases in a number of faujasite-related zeolite materials have been studied using transmission electron microscopy, and high-resolution powder X-ray diffraction. In Y, CSZ-1, CSZ-3, ZSM-2, ZSM-3, ZSM-20, ECR-35, ECR-30 and EMC-2 materials, the FAU and EMT components segregate non-randomly into contiguous blocks. This segregation is most pronounced in ZSM-20 and ECR-35. ECR-30 and EMC-2 are both predominantly EMT framework materials, within which FAU intergrowths occur in clumps of 1, 2 or 3 layers. No evidence is found for extended superlattice ordering of intergrowths. Intergrowth segregation acts to reduce both the configurational entropy associated with the stacking statistics and the elastic energy associated with coherency strain.

Original language	English (US)
Pages (from-to)	813-840
Number of pages	28
Journal	Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume	452
Issue number	1947
DOIs	https://doi.org/10.1098/rspa.1996.0041
State	Published - Jan 1 1996
Externally published	Yes

ASJC Scopus subject areas

General Mathematics
General Engineering
General Physics and Astronomy

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title = "Intergrowth segregation in FAU-EMT zeolite materials",

abstract = "Intergrowths of cubic (FAU) and hexagonal (EMT) structural phases in a number of faujasite-related zeolite materials have been studied using transmission electron microscopy, and high-resolution powder X-ray diffraction. In Y, CSZ-1, CSZ-3, ZSM-2, ZSM-3, ZSM-20, ECR-35, ECR-30 and EMC-2 materials, the FAU and EMT components segregate non-randomly into contiguous blocks. This segregation is most pronounced in ZSM-20 and ECR-35. ECR-30 and EMC-2 are both predominantly EMT framework materials, within which FAU intergrowths occur in clumps of 1, 2 or 3 layers. No evidence is found for extended superlattice ordering of intergrowths. Intergrowth segregation acts to reduce both the configurational entropy associated with the stacking statistics and the elastic energy associated with coherency strain.",

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AU - Vaughan, D. E.W.

AU - Strohmaier, K. G.

AU - Newsam, J. M.

PY - 1996/1/1

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N2 - Intergrowths of cubic (FAU) and hexagonal (EMT) structural phases in a number of faujasite-related zeolite materials have been studied using transmission electron microscopy, and high-resolution powder X-ray diffraction. In Y, CSZ-1, CSZ-3, ZSM-2, ZSM-3, ZSM-20, ECR-35, ECR-30 and EMC-2 materials, the FAU and EMT components segregate non-randomly into contiguous blocks. This segregation is most pronounced in ZSM-20 and ECR-35. ECR-30 and EMC-2 are both predominantly EMT framework materials, within which FAU intergrowths occur in clumps of 1, 2 or 3 layers. No evidence is found for extended superlattice ordering of intergrowths. Intergrowth segregation acts to reduce both the configurational entropy associated with the stacking statistics and the elastic energy associated with coherency strain.

AB - Intergrowths of cubic (FAU) and hexagonal (EMT) structural phases in a number of faujasite-related zeolite materials have been studied using transmission electron microscopy, and high-resolution powder X-ray diffraction. In Y, CSZ-1, CSZ-3, ZSM-2, ZSM-3, ZSM-20, ECR-35, ECR-30 and EMC-2 materials, the FAU and EMT components segregate non-randomly into contiguous blocks. This segregation is most pronounced in ZSM-20 and ECR-35. ECR-30 and EMC-2 are both predominantly EMT framework materials, within which FAU intergrowths occur in clumps of 1, 2 or 3 layers. No evidence is found for extended superlattice ordering of intergrowths. Intergrowth segregation acts to reduce both the configurational entropy associated with the stacking statistics and the elastic energy associated with coherency strain.

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Intergrowth segregation in FAU-EMT zeolite materials

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