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Advances in understanding of swift heavy-ion tracks in complex ceramics

Lang, Maik and Devanathan, Ram and Toulemonde, Marcel and Trautmann, Christina (2015):
Advances in understanding of swift heavy-ion tracks in complex ceramics.
In: Current Opinion in Solid State and Materials Science, Pergamon-Elsevier Science Ltd, Oxford, England, pp. 39-48, 19, (1), ISSN 13590286, [Online-Edition: http://dx.doi.org/10.1016/j.cossms.2014.10.002],
[Article]

Abstract

Tracks produced by swift heavy ions in ceramics are of interest for fundamental science as well as for applications covering different fields such as nanotechnology or fission-track dating of minerals. In the case of pyrochlores with general formula A(2)B(2)O(7), the track structure and radiation sensitivity show a clear dependence on the composition. Ion irradiated Gd2Zr2O7, e.g., retains its crystallinity while amorphous tracks are produced in Gd2Ti2O7. Tracks in Ti-containing compositions have a complex morphology consisting of an amorphous core surrounded by a shell of a disordered, defect-fluorite phase. The size of the amorphous core decreases with decreasing energy loss and with increasing Zr content, while the shell thickness seems to be similar over a wide range of energy loss values. The large data set and the complex track structure has made pyrochlore an interesting model system for a general theoretical description of track formation including thermal spike calculations (providing the spatial and temporal evolution of temperature around the ion trajectory) and molecular dynamics (MD) simulations (describing the response of the atomic system). Recent MD advances consider the sudden temperature increase by inserting data from the thermal spike. The combination allows the reproduction of the core-shell track characteristic and sheds light on the early stages of track formation including recrystallization of the molten material produced by the thermal spike. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2015
Creators: Lang, Maik and Devanathan, Ram and Toulemonde, Marcel and Trautmann, Christina
Title: Advances in understanding of swift heavy-ion tracks in complex ceramics
Language: English
Abstract:

Tracks produced by swift heavy ions in ceramics are of interest for fundamental science as well as for applications covering different fields such as nanotechnology or fission-track dating of minerals. In the case of pyrochlores with general formula A(2)B(2)O(7), the track structure and radiation sensitivity show a clear dependence on the composition. Ion irradiated Gd2Zr2O7, e.g., retains its crystallinity while amorphous tracks are produced in Gd2Ti2O7. Tracks in Ti-containing compositions have a complex morphology consisting of an amorphous core surrounded by a shell of a disordered, defect-fluorite phase. The size of the amorphous core decreases with decreasing energy loss and with increasing Zr content, while the shell thickness seems to be similar over a wide range of energy loss values. The large data set and the complex track structure has made pyrochlore an interesting model system for a general theoretical description of track formation including thermal spike calculations (providing the spatial and temporal evolution of temperature around the ion trajectory) and molecular dynamics (MD) simulations (describing the response of the atomic system). Recent MD advances consider the sudden temperature increase by inserting data from the thermal spike. The combination allows the reproduction of the core-shell track characteristic and sheds light on the early stages of track formation including recrystallization of the molten material produced by the thermal spike. (C) 2014 Elsevier Ltd. All rights reserved.

Journal or Publication Title: Current Opinion in Solid State and Materials Science
Volume: 19
Number: 1
Publisher: Pergamon-Elsevier Science Ltd, Oxford, England
Uncontrolled Keywords: Swift heavy Ions, Pyrochlores, Tracks, Thermal spike, MD simulation
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 13:52
Official URL: http://dx.doi.org/10.1016/j.cossms.2014.10.002
Identification Number: doi:10.1016/j.cossms.2014.10.002
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 #DE-SC0001089 (UT).
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