Ion mobility and dynamic disordering of water in analcime

Abstract Ions and water molecules mobilities were studied by the 7Li, 23Na, 1H nuclear magnetic resonance in the framework aluminosilicate mineral analcime and in its cation-exchanged (lithium) form. It has been found that cation exchange as well as dehydration alter radically dynamics of particles...

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Bibliographic Details
Published in:Physics and chemistry of minerals 1998-03, Vol.25 (4), p.282-287
Main Authors: Moroz, N. K., Afanassyev, I. S., Fursenko, B. A., Belitsky, I. A.
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Cation exchange
Cation exchanging
Cations
Dehydration
Free energy
Heat of formation
Ion diffusion
Ionic mobility
Lithium
Lithium isotopes
NMR
Nuclear magnetic resonance
Water chemistry
Zeolites
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Summary:Abstract Ions and water molecules mobilities were studied by the 7Li, 23Na, 1H nuclear magnetic resonance in the framework aluminosilicate mineral analcime and in its cation-exchanged (lithium) form. It has been found that cation exchange as well as dehydration alter radically dynamics of particles interposed in channels of the zeolite framework. The highest mobility of alkali cations with the diffusion activation energy of 0.52 eV was detected in hydrated Li-analcime. The ion diffusion increase with temperature is accompanied by an increase in the dynamic orientational disordering of water sublattice. The energy of formation of structural defects responsible for ion diffusion and water disordering was deduced to be 0.2 eV. As a possible defect, the occupation of water positions by cations is discussed (model of bridging-type ion diffusion).
ISSN:0342-1791
1432-2021
DOI:10.1007/s002690050115