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Analytical Electron Microscopy Study of Electron Radiation Damage in Iron Phosphate Glass Waste Forms

Published online by Cambridge University Press:  11 February 2011

K. Sun ,
L. M. Wang  and
R. C. Ewing
K. Sun
Affiliation:
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109
L. M. Wang
Affiliation:
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109
R. C. Ewing
Affiliation:
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109
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Abstract

A series of iron phosphate glass waste forms with compositions of 45Fe2O3-55P2O5, 20Fe2O3-80P2O5, and 20Fe2O3-20Na2O-60P2O5, namely FeP-1, FeP-2 and FeP-3, was studied by analytical electron microscopy (AEM). Transmission electron microscopy (TEM) bright-field (BF) imaging showed that under the electron irradiation, phase segregation occurred in both the FeP-1 and FeP-2 samples at high electron doses (3.84×1026 e/m2). In contrast, bubbles formed in the FeP-3 sample, even at a relatively low dose (2.88×1025 e/m2), which may be attributed to the migration of Na under irradiation as in the case in sodium borosilicate glass. Series electron energy-loss spectroscopy (EELS) analysis showed that the glass materials experienced mass-loss and composition variation. No obvious Fe valence state changes under irradiation were observed within the irradiation period.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II5.3
Copyright
Copyright © Materials Research Society 2003

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