Disorder and dynamics in pollucite from 133Cs and 27Al NMR

Ashbrook, S. E. and Whittle, K. R. and Le Pollès, L. and Farnan, I. (2005) Disorder and dynamics in pollucite from 133Cs and 27Al NMR. Journal of the American Ceramic Society, 88 (6). pp. 1575-1583. DOI 10.1111/j.1551-2916.2005.00294.x

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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.

Item Type: Article
Uncontrolled Keywords: 2005 AREP IA46 2005 P IA48
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of the American Ceramic Society
Volume: 88
Page Range: pp. 1575-1583
Identification Number: 10.1111/j.1551-2916.2005.00294.x
Depositing User: Sarah Humbert
Date Deposited: 06 Sep 2011 14:43
Last Modified: 23 Jul 2013 09:58
URI: http://eprints.esc.cam.ac.uk/id/eprint/1572

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