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Swift heavy ion track formation in Gd2Zr2−xTixO7 pyrochlore: Effect of electronic energy loss

Lang, Maik and Toulemonde, Marcel and Zhang, Jiaming and Zhang, Fuxiang and Tracy, Cameron L. and Lian, Jie and Wang, Zhongwu and Weber, William J. and Severin, Daniel and Bender, Markus and Trautmann, Christina and Ewing, Rodney C. (2014):
Swift heavy ion track formation in Gd2Zr2−xTixO7 pyrochlore: Effect of electronic energy loss.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science Publishing, pp. 102-115, 336, ISSN 0168583X, [Online-Edition: http://dx.doi.org/10.1016/j.nimb.2014.06.019],
[Article]

Abstract

The morphology of swift heavy ion tracks in the Gd2Zr2−xTixO7 pyrochlore system has been investigated as a function of the variation in chemical composition and electronic energy loss, dE/dx, over a range of energetic ions: 58Ni, 101Ru, 129Xe, 181Ta, 197Au, 208Pb, and 238U of 11.1 MeV/u specific energy. Bright-field transmission electron microscopy, synchrotron X-ray diffraction, and Raman spectroscopy reveal an increasing degree of amorphization with increasing Ti-content and dE/dx. The size and morphology of individual ion tracks in Gd2Ti2O7 were characterized by high-resolution transmission electron microscopy revealing a core–shell structure with an outer defect-fluorite dominated shell at low dE/dx to predominantly amorphous tracks at high dE/dx. Inelastic thermal-spike calculations have been used together with atomic-scale characterization of ion tracks in Gd2Ti2O7 by high resolution transmission electron microscopy to deduce critical energy densities for the complex core–shell morphologies induced by ions of different dE/dx.

Item Type: Article
Erschienen: 2014
Creators: Lang, Maik and Toulemonde, Marcel and Zhang, Jiaming and Zhang, Fuxiang and Tracy, Cameron L. and Lian, Jie and Wang, Zhongwu and Weber, William J. and Severin, Daniel and Bender, Markus and Trautmann, Christina and Ewing, Rodney C.
Title: Swift heavy ion track formation in Gd2Zr2−xTixO7 pyrochlore: Effect of electronic energy loss
Language: English
Abstract:

The morphology of swift heavy ion tracks in the Gd2Zr2−xTixO7 pyrochlore system has been investigated as a function of the variation in chemical composition and electronic energy loss, dE/dx, over a range of energetic ions: 58Ni, 101Ru, 129Xe, 181Ta, 197Au, 208Pb, and 238U of 11.1 MeV/u specific energy. Bright-field transmission electron microscopy, synchrotron X-ray diffraction, and Raman spectroscopy reveal an increasing degree of amorphization with increasing Ti-content and dE/dx. The size and morphology of individual ion tracks in Gd2Ti2O7 were characterized by high-resolution transmission electron microscopy revealing a core–shell structure with an outer defect-fluorite dominated shell at low dE/dx to predominantly amorphous tracks at high dE/dx. Inelastic thermal-spike calculations have been used together with atomic-scale characterization of ion tracks in Gd2Ti2O7 by high resolution transmission electron microscopy to deduce critical energy densities for the complex core–shell morphologies induced by ions of different dE/dx.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 336
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Swift heavy ions, Pyrochlore, Ceramics, Amorphization, Disordering
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: 12 Jan 2015 12:43
Official URL: http://dx.doi.org/10.1016/j.nimb.2014.06.019
Identification Number: doi:10.1016/j.nimb.2014.06.019
Funders: This work was supported as part of the Materials Science of Actinides, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001089 (UM, UT) , and Contract DE-AC05-00OR22725 (ORNL). , The use of CHESS beam is supported by the NSF & NIH/NIGMS via NSF award DMR-0225180., One of the authors (M.T.) is grateful to Professor Ewing at the University of Michigan for the financial support for his two-month visit.
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