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SAXS investigations of the morphology of swift heavy ion tracks in α-quartz

Afra, B. and Rodriguez, M. D. and Trautmann, C. and Pakarinen, O. H. and Djurabekova, F. and Nordlund, K. and Bierschenk, T. and Giulian, R. and Ridgway, M. C. and Rizza, G. and Kirby, N. and Toulemonde, M. and Kluth, P. (2012):
SAXS investigations of the morphology of swift heavy ion tracks in α-quartz.
In: Journal of Physics: Condensed Matter, IOP Publishing, pp. 045006, 25, (4), ISSN 0953-8984,
[Online-Edition: http://dx.doi.org/10.1088/0953-8984/25/4/045006],
[Article]

Abstract

The morphology of swift heavy ion tracks in crystalline α-quartz was investigated using small angle x-ray scattering (SAXS), molecular dynamics (MD) simulations and transmission electron microscopy. Tracks were generated by irradiation with heavy ions with energies between 27 MeV and 2.2 GeV. The analysis of the SAXS data indicates a density change of the tracks of ~2 ± 1% compared to the surrounding quartz matrix for all irradiation conditions. The track radii only show a weak dependence on the electronic energy loss at values above 17 keV nm−1, in contrast to values previously reported from Rutherford backscattering spectrometry measurements and expectations from the inelastic thermal spike model. The MD simulations are in good agreement at low energy losses, yet predict larger radii than SAXS at high ion energies. The observed discrepancies are discussed with respect to the formation of a defective halo around an amorphous track core, the existence of high stresses and/or the possible presence of a boiling phase in quartz predicted by the inelastic thermal spike model.

Item Type: Article
Erschienen: 2012
Creators: Afra, B. and Rodriguez, M. D. and Trautmann, C. and Pakarinen, O. H. and Djurabekova, F. and Nordlund, K. and Bierschenk, T. and Giulian, R. and Ridgway, M. C. and Rizza, G. and Kirby, N. and Toulemonde, M. and Kluth, P.
Title: SAXS investigations of the morphology of swift heavy ion tracks in α-quartz
Language: English
Abstract:

The morphology of swift heavy ion tracks in crystalline α-quartz was investigated using small angle x-ray scattering (SAXS), molecular dynamics (MD) simulations and transmission electron microscopy. Tracks were generated by irradiation with heavy ions with energies between 27 MeV and 2.2 GeV. The analysis of the SAXS data indicates a density change of the tracks of ~2 ± 1% compared to the surrounding quartz matrix for all irradiation conditions. The track radii only show a weak dependence on the electronic energy loss at values above 17 keV nm−1, in contrast to values previously reported from Rutherford backscattering spectrometry measurements and expectations from the inelastic thermal spike model. The MD simulations are in good agreement at low energy losses, yet predict larger radii than SAXS at high ion energies. The observed discrepancies are discussed with respect to the formation of a defective halo around an amorphous track core, the existence of high stresses and/or the possible presence of a boiling phase in quartz predicted by the inelastic thermal spike model.

Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 25
Number: 4
Publisher: IOP Publishing
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: 21 Mar 2014 13:01
Official URL: http://dx.doi.org/10.1088/0953-8984/25/4/045006
Identification Number: doi:10.1088/0953-8984/25/4/045006
Funders: PK acknowledges the Australian Research Council for financial support., OP is grateful to the Academy of Finland for financial support.
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