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Molecular Dynamic Simulation of Cascade Overlap and Amorphization in 3C-SiC

Published online by Cambridge University Press:  21 March 2011

Fei Gao  and
William J. Weber
Fei Gao
Affiliation:
Pacific Northwest National Laboratory, MS K8-93, P. O. Box 999, Richland, WA 99352, USA
William J. Weber
Affiliation:
Pacific Northwest National Laboratory, MS K8-93, P. O. Box 999, Richland, WA 99352, USA
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Abstract

Molecular dynamics (MD) simulations have been employed to study cascade overlap and defect accumulation processes during amorphization in 3C-SiC. A large number of 10 keV displacement cascades were randomly generated in a model crystal to achieve the amorphous state, and the corresponding dose is consistent with experimental observations. The results show that most defects are single interstitials and mono-vacancies at low dose, whereas the amorphous or disordered clusters, which consist of interstitials and antisite defects, appear at intermediate dose levels. These local disordered regions play an important role in the amorphization of SiC. At higher doses, a significant proportion of antisite defects is created during continued cascade overlap. The increase in interstitials and antisite defects with increasing dose suggests that the primary driving force for the crystalline-to-amorphous transition under these ion irradiation conditions in SiC is due to the accumulation of both Frenkel pairs and antisite defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R3.20
Copyright
Copyright © Materials Research Society 2001

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