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Characterization of swift heavy ion irradiation damage in ceria

Published online by Cambridge University Press:  04 March 2015

Clarissa A. Yablinsky*
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Ram Devanathan
Affiliation:
Nuclear Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
Janne Pakarinen
Affiliation:
Fuel Materials Group, Institute for Nuclear Research Center (SCK•CEN), B-2400 Mol, Belgium
Jian Gan
Affiliation:
Nuclear Fuels & Materials Division, Idaho National Laboratory, Idaho Falls, Idaho 83415, USA
Daniel Severin
Affiliation:
GSI Helmholtzzentrum, 64291 Darmstadt, Germany
Christina Trautmann
Affiliation:
GSI Helmholtzzentrum, 64291 Darmstadt, Germany; and Technische Universität Darmstadt, 64287 Darmstadt, Germany
Todd R. Allen
Affiliation:
Engineering Physics Department, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
*
a)Address all correspondence to this author. e-mail: rizz@lanl.gov
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Abstract

Swift heavy ion induced radiation damage is investigated for ceria (CeO2), which serves as a UO2 fuel surrogate. Microstructural changes resulting from an irradiation with 940 MeV gold ions of 42 keV/nm electronic energy loss are investigated by means of electron microscopy accompanied by electron energy loss spectroscopy showing that there exists a small density reduction in the ion track core. While chemical changes in the ion track are not precluded, evidence of them was not observed. Classical molecular dynamics simulations of thermal spikes in CeO2 with an energy deposition of 12 and 36 keV/nm show damage consisting of isolated point defects at 12 keV/nm, and defect clusters at 36 keV/nm, with no amorphization at either energy. Inferences are drawn from modeling about density changes in the ion track and the formation of interstitial loops that shed light on features observed by electron microscopy of swift heavy ion irradiated ceria.

Type
Articles
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

b)

C.A. Yablinsky and R. Devanathan contributed equally to this work

c)

This work was performed while C.A. Yablinsky and J. Pakarinen were at Engineering Physics Department, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA

Contributing Editor: Joel Ribis

References

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