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Characterization of swift heavy ion irradiation damage in ceria

Yablinsky, Clarissa A. and Devanathan, Ram and Pakarinen, Janne and Gan, Jian and Severin, Daniel and Trautmann, Christina and Allen, Todd R. (2015):
Characterization of swift heavy ion irradiation damage in ceria.
In: Journal of Materials Research, Cambridge University Press, New York, USA, pp. 1473-1484, 30, (09), ISSN 0884-2914, [Online-Edition: http://dx.doi.org/10.1557/jmr.2015.43],
[Article]

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.

Item Type: Article
Erschienen: 2015
Creators: Yablinsky, Clarissa A. and Devanathan, Ram and Pakarinen, Janne and Gan, Jian and Severin, Daniel and Trautmann, Christina and Allen, Todd R.
Title: Characterization of swift heavy ion irradiation damage in ceria
Language: English
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.

Journal or Publication Title: Journal of Materials Research
Volume: 30
Number: 09
Publisher: Cambridge University Press, New York, USA
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Feb 2016 13:28
Official URL: http://dx.doi.org/10.1557/jmr.2015.43
Identification Number: doi:10.1557/jmr.2015.43
Funders: Experimental results are supported as part of the Center for Materials Science of Nuclear Fuel, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number FWP 1356., Modeling results were supported by the Materials Science and Engineering Division, Office of Basic Energy Sciences, US Department of Energy under Contract DE-AC05-76RL01830., This research was performed using the resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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