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Disorder and Dynamics in Pollucite from 133Cs and 27Al NMR

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Abstract:

Pollucite, CsAlSi2O6, a Cs polymorph of leucite (KAlSi2O6), has been proposed for ceramic immobilization of 135Cs and 137Cs fission products. 133Cs NMR of both low- (tetragonal) and high-temperature (cubic) forms of pollucite exhibit a considerable distribution of local Cs environments. 29Si and 27Al NMR data from directly prepared pollucite show greater Al/Si disorder than either leucite, or pollucite produced by ion exchange. Little evidence for Cs motion is observed in tetragonal or cubic pollucite, and only at high temperatures (∼850°C) is any substantial dynamic behavior detected. Dynamic NMR lineshape calculations allow a determination of the frequency of Cs motion and diffusivity.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00294.x

Affiliations: Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, U.K.

Publication date: June 1, 2005

bsc/jace/2005/00000088/00000006/art00034
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