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Title: He+ ion irradiation response of Fe–TiO2 multilayers

Abstract

The accumulation of radiation-induced defect clusters and He bubble formation in He+ ion irradiated nanocrystalline TiO2 and Fe–TiO2 multilayer thin films were investigated using transmission electron microscopy (TEM). Prior to ion irradiation it was found that the crystallinity of TiO2 layers depends on the individual layer thickness: While all TiO2 layers are amorphous at 5 nm individual layer thickness, at 100 nm they are crystalline with a rutile polymorph. After He+ irradiation up to ~6 dpa at room temperature, amorphization of TiO2 layers was not observed in both nanocrystalline TiO2 single layers and Fe–TiO2 multilayers. The suppression of radiation-induced amorphization in TiO2 is interpreted in terms of a high density of defect sinks in these nano-composites in the form of Fe–TiO2 interphase boundaries and columnar grains within each layer with nano-scale intercolumnar porosity. In addition, a high concentration of He is believed to be trapped at these interfaces in the form of sub-nanometer-scale clusters retarding the formation of relatively larger He bubbles that can be resolved in TEM.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Materials at Irradiation and Mechanical Extremes (CMIME)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1386434
DOE Contract Number:  
2008LANL1026
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 435; Journal Issue: 1-3; Related Information: CMIME partners with Los Alamos National Laboratory (lead); Carnegie Mellon University; University of Illinois, Urbana Champaign; Massachusetts Institute of Technology; University of Nebraska; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; nuclear (including radiation effects), defects, mechanical behavior, materials and chemistry by design, synthesis (novel materials), synthesis (scalable processing)

Citation Formats

Anderoglu, O., Zhou, M. J., Zhang, J., Wang, Y. Q., Maloy, S. A., Baldwin, J. K., and Misra, A. He+ ion irradiation response of Fe–TiO2 multilayers. United States: N. p., 2013. Web. doi:10.1016/j.jnucmat.2012.12.036.
Anderoglu, O., Zhou, M. J., Zhang, J., Wang, Y. Q., Maloy, S. A., Baldwin, J. K., & Misra, A. He+ ion irradiation response of Fe–TiO2 multilayers. United States. doi:10.1016/j.jnucmat.2012.12.036.
Anderoglu, O., Zhou, M. J., Zhang, J., Wang, Y. Q., Maloy, S. A., Baldwin, J. K., and Misra, A. Mon . "He+ ion irradiation response of Fe–TiO2 multilayers". United States. doi:10.1016/j.jnucmat.2012.12.036.
@article{osti_1386434,
title = {He+ ion irradiation response of Fe–TiO2 multilayers},
author = {Anderoglu, O. and Zhou, M. J. and Zhang, J. and Wang, Y. Q. and Maloy, S. A. and Baldwin, J. K. and Misra, A.},
abstractNote = {The accumulation of radiation-induced defect clusters and He bubble formation in He+ ion irradiated nanocrystalline TiO2 and Fe–TiO2 multilayer thin films were investigated using transmission electron microscopy (TEM). Prior to ion irradiation it was found that the crystallinity of TiO2 layers depends on the individual layer thickness: While all TiO2 layers are amorphous at 5 nm individual layer thickness, at 100 nm they are crystalline with a rutile polymorph. After He+ irradiation up to ~6 dpa at room temperature, amorphization of TiO2 layers was not observed in both nanocrystalline TiO2 single layers and Fe–TiO2 multilayers. The suppression of radiation-induced amorphization in TiO2 is interpreted in terms of a high density of defect sinks in these nano-composites in the form of Fe–TiO2 interphase boundaries and columnar grains within each layer with nano-scale intercolumnar porosity. In addition, a high concentration of He is believed to be trapped at these interfaces in the form of sub-nanometer-scale clusters retarding the formation of relatively larger He bubbles that can be resolved in TEM.},
doi = {10.1016/j.jnucmat.2012.12.036},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = 1-3,
volume = 435,
place = {United States},
year = {2013},
month = {4}
}