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Electron Irradiation of Zeolites

Published online by Cambridge University Press:  15 February 2011

S. X. Wang ,
L. M. Wang  and
R. C. Ewing
S. X. Wang
Affiliation:
Department of Nuclear Engineering & Radiological Sciences, The University of Michigan, Ann Arbor, MI 48109, USA, shixin@engin.umich.edu
L. M. Wang
Affiliation:
Department of Nuclear Engineering & Radiological Sciences, The University of Michigan, Ann Arbor, MI 48109, USA, shixin@engin.umich.edu
R. C. Ewing
Affiliation:
Department of Nuclear Engineering & Radiological Sciences, The University of Michigan, Ann Arbor, MI 48109, USA, shixin@engin.umich.edu
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Abstract

Three different zeolites (analcime, natrolite, and zeolite-Y) were irradiated with 200 keV and 400 keV electrons. All zeolites amorphized under a relatively low electron fluence. The transformation from the crystalline-to-amorphous state was continuous and homogeneous. The electron fluences for amorphization of the three zeolites at room temperature were: 7.0× 1019 e/cm2 (analcime), 1.8×1020 e/cm2 (natrolite), and 3.4×1020 e/cm2 (zeolite-Y). The different susceptibilities to amorphization are attributed to the different channel sizes in the structures which are the pathways for the release of water molecules and Na+. Natrolite formed bubbles under electron irradiation, even before complete amorphization. Analcime formed bubbles after amorphization. Zeolite-Y did not form bubbles under irradiation. The differences in bubble formation are attributed to the different channel sizes of the three zeolites. The amorphization dose was also measured at different temperatures. An inverse temperature dependence of amorphization dose was observed for all three zeolites: electron dose for amorphization decreased with increasing temperature. This unique temperature effect is attributed to the fact that zeolites are thermally unstable. A semi-empirical model was derived to describe the temperature effect of amorphization in these zeolites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 361
Copyright
Copyright © Materials Research Society 1999

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