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

Sharon Elizabeth Ashbrook; Karl R Whittle; Laurent Le Polles; Ian Farnan

doi:10.1111/j.1551-2916.2005.00294.x

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

Sharon Elizabeth Ashbrook, Karl R Whittle, Laurent Le Polles, Ian Farnan

Research output: Contribution to journal › Article › peer-review

Abstract

Pollucite, CsAlSi2O6, a Cs polymorph of leucite (KAISi(2)O(6)), has been proposed for ceramic immobilization of Cs-135 and Cs-137 fission products. Cs NMR of both low- (tetragonal) and high-temperature (cubic) forms of pollucite exhibit a considerable distribution of local Cs environments. Si-29 and Al-27 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 (similar to 850 degrees C) is any substantial dynamic behavior detected. Dynamic NMR lineshape calculations allow a determination of the frequency of Cs motion and diffushity.

Original language	English
Pages (from-to)	1575-1583
Number of pages	9
Journal	Journal of the American Ceramic Society
Volume	88
DOIs	https://doi.org/10.1111/j.1551-2916.2005.00294.x
Publication status	Published - Jun 2005

Keywords

SOLID-STATE NMR
MULTIPLE-QUANTUM MAS
NUCLEAR-MAGNETIC-RESONANCE
INTEGER QUADRUPOLAR NUCLEI
SI-AL ORDER
SPECTROSCOPY
LEUCITE
TEMPERATURE
TRANSITIONS
ANALCIME

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10.1111/j.1551-2916.2005.00294.x

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title = "Disorder and Dynamics in Pollucite from 133Cs and 27Al NMR",

abstract = "Pollucite, CsAlSi2O6, a Cs polymorph of leucite (KAISi(2)O(6)), has been proposed for ceramic immobilization of Cs-135 and Cs-137 fission products. Cs NMR of both low- (tetragonal) and high-temperature (cubic) forms of pollucite exhibit a considerable distribution of local Cs environments. Si-29 and Al-27 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 (similar to 850 degrees C) is any substantial dynamic behavior detected. Dynamic NMR lineshape calculations allow a determination of the frequency of Cs motion and diffushity.",

keywords = "SOLID-STATE NMR, MULTIPLE-QUANTUM MAS, NUCLEAR-MAGNETIC-RESONANCE, INTEGER QUADRUPOLAR NUCLEI, SI-AL ORDER, SPECTROSCOPY, LEUCITE, TEMPERATURE, TRANSITIONS, ANALCIME",

author = "Ashbrook, {Sharon Elizabeth} and Whittle, {Karl R} and {Le Polles}, Laurent and Ian Farnan",

year = "2005",

month = jun,

doi = "10.1111/j.1551-2916.2005.00294.x",

language = "English",

volume = "88",

pages = "1575--1583",

journal = "Journal of the American Ceramic Society",

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T1 - Disorder and Dynamics in Pollucite from 133Cs and 27Al NMR

AU - Ashbrook, Sharon Elizabeth

AU - Whittle, Karl R

AU - Le Polles, Laurent

AU - Farnan, Ian

PY - 2005/6

Y1 - 2005/6

N2 - Pollucite, CsAlSi2O6, a Cs polymorph of leucite (KAISi(2)O(6)), has been proposed for ceramic immobilization of Cs-135 and Cs-137 fission products. Cs NMR of both low- (tetragonal) and high-temperature (cubic) forms of pollucite exhibit a considerable distribution of local Cs environments. Si-29 and Al-27 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 (similar to 850 degrees C) is any substantial dynamic behavior detected. Dynamic NMR lineshape calculations allow a determination of the frequency of Cs motion and diffushity.

AB - Pollucite, CsAlSi2O6, a Cs polymorph of leucite (KAISi(2)O(6)), has been proposed for ceramic immobilization of Cs-135 and Cs-137 fission products. Cs NMR of both low- (tetragonal) and high-temperature (cubic) forms of pollucite exhibit a considerable distribution of local Cs environments. Si-29 and Al-27 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 (similar to 850 degrees C) is any substantial dynamic behavior detected. Dynamic NMR lineshape calculations allow a determination of the frequency of Cs motion and diffushity.

KW - SOLID-STATE NMR

KW - MULTIPLE-QUANTUM MAS

KW - NUCLEAR-MAGNETIC-RESONANCE

KW - INTEGER QUADRUPOLAR NUCLEI

KW - SI-AL ORDER

KW - SPECTROSCOPY

KW - LEUCITE

KW - TEMPERATURE

KW - TRANSITIONS

KW - ANALCIME

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U2 - 10.1111/j.1551-2916.2005.00294.x

DO - 10.1111/j.1551-2916.2005.00294.x

M3 - Article

SN - 0002-7820

VL - 88

SP - 1575

EP - 1583

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

ER -

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

Abstract

Keywords

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