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From multiply twinned to fcc nanoparticles via irradiation-induced transient amorphization

Jaervi, T. T. and Pohl, D. and Albe, K. and Rellinghaus, B. and Schultz, L. and Fassbender, J. and Kuronen, A. and Nordlund, K. (2009):
From multiply twinned to fcc nanoparticles via irradiation-induced transient amorphization.
In: Europhys. Lett., IOP Publishing, pp. 26001-p1, 85, (2), [Online-Edition: http://iopscience.iop.org/0295-5075/85/2/26001/],
[Article]

Abstract

We present experimental evidence for structural transformation of multiply twinned CuAu nanoparticles to single-crystalline morphology by 0.5 keV helium irradiation. This finding is unexpected as the stability of twin boundaries should not be affected by ion-beam-induced Frenkel pairs. Molecular-dynamics simulations reveal, however, a new transformation mechanism based on transient amorphization of the particle. By comparing with irradiation simulations of elemental nanoparticles, as well as alloyed bulk samples and surface cascades, we show that this transformation route is only present in alloyed particles. Moreover, the observed amorphization is more efficient for twinned than single-crystalline particles. This, together with the fast recrystallization kinetics in CuAu, explains the experimentally observed untwinning process. Copyright (C) EPLA, 2009

Item Type: Article
Erschienen: 2009
Creators: Jaervi, T. T. and Pohl, D. and Albe, K. and Rellinghaus, B. and Schultz, L. and Fassbender, J. and Kuronen, A. and Nordlund, K.
Title: From multiply twinned to fcc nanoparticles via irradiation-induced transient amorphization
Language: English
Abstract:

We present experimental evidence for structural transformation of multiply twinned CuAu nanoparticles to single-crystalline morphology by 0.5 keV helium irradiation. This finding is unexpected as the stability of twin boundaries should not be affected by ion-beam-induced Frenkel pairs. Molecular-dynamics simulations reveal, however, a new transformation mechanism based on transient amorphization of the particle. By comparing with irradiation simulations of elemental nanoparticles, as well as alloyed bulk samples and surface cascades, we show that this transformation route is only present in alloyed particles. Moreover, the observed amorphization is more efficient for twinned than single-crystalline particles. This, together with the fast recrystallization kinetics in CuAu, explains the experimentally observed untwinning process. Copyright (C) EPLA, 2009

Journal or Publication Title: Europhys. Lett.
Volume: 85
Number: 2
Publisher: IOP Publishing
Uncontrolled Keywords: Semiconductors, Nanoscale science and low-D systems, structural, mechanical & thermal
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Feb 2012 14:55
Official URL: http://iopscience.iop.org/0295-5075/85/2/26001/
Identification Number: doi:10.1209/0295-5075/85/26001
Related URLs:
Funders: A part of this work was performed within the Finnish Centre of Excellence in Computational Molecular Science (CMS)., We also gratefully acknowledge support within an exhange program from the Academy of Finland and the German Foreign Exchange Service (DAAD), as well as the grants of computer time from CSC, the Finnish IT centre for science.
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