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Flexibility windows and phase transitions of ordered and disordered ANA framework zeolites

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Wells, Stephen A., Sartbaeva, Asel and Gatta, G. D. (2011) Flexibility windows and phase transitions of ordered and disordered ANA framework zeolites. EPL (Europhysics Letters), Vol.94 (No.5). 56001p1-56001p5. doi:10.1209/0295-5075/94/56001

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Official URL: http://dx.doi.org/10.1209/0295-5075/94/56001

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Abstract

The analcime-like feldspathoids are a group of microporous minerals with the ANA framework topology. Analcime proper has predominantly Na as its channel cation content, while leucite contains predominantly K, pollucite contains Cs and wairakite contains Ca. Under compression, all these minerals display structural displacive phase transitions to low-symmetry forms at relatively low pressures ( 0.5-3.2GPa). We show, using geometric simulation, that these phase transitions are controlled by the "flexibility window" of the ANA framework, defined as the range of framework densities over which the tetrahedral units of the framework can in principle be made geometrically ideal. We discuss experimental compression data for these minerals and its relationship to the theoretical flexibility of the ANA framework, the influence of cation content, and framework ordering. Copyright (C) EPLA, 2011

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QE Geology
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH): Analcime, Zeolites, Pollucite, Leucite, Quartz, Algorithms, Phase transformations (Statistical physics)
Journal or Publication Title: EPL (Europhysics Letters)
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0295-5075
Official Date: June 2011
Dates:
DateEvent
June 2011Published
Volume: Vol.94
Number: No.5
Number of Pages: 5
Page Range: 56001p1-56001p5
DOI: 10.1209/0295-5075/94/56001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Glasstone Research Fellowship, Royal Society (Great Britain)

Data sourced from Thomson Reuters' Web of Knowledge

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