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A PH₂O-dependent structural phase transition in the zeolite natrolite
-
Hsiu-Wen Wang
and
David L. Bish
Published/Copyright:
April 1, 2015
Abstract
The crystal structures of natrolite and its dehydrated high-temperature phases (α1- and α2- metanatrolite) have been determined from powder X-ray diffraction measurements as a function of temperature and partial pressure of water (PH₂O) to characterize the phase transition behavior. The evolution of crystal structure as a function of temperature shows two different phase transitions, depending on the PH₂O, with α1-metanatrolite occurring at elevated PH₂O and α2-metanatrolite occurring at low PH₂O. Our discovery of α2-metanatrolite implies the existence of more than one transition mechanism, which we correlate with the migration of Na+ ions and the rate of evolution of H2O molecules. The transition behavior is rationalized in terms of two cooperating mechanisms: (1) dehydration-induced processes, which determine the phase transition temperature; and (2) thermally induced processes, which determine how the framework and its extraframework cations are modified.
Received: 2008-2-6
Accepted: 2008-4-4
Published Online: 2015-4-1
Published in Print: 2008-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- First-principles calculation of the infrared spectrum of hematite
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