Journal
DIAMOND AND RELATED MATERIALS
Volume 19, Issue 10, Pages 1240-1244Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2010.06.010
Keywords
First-principles calculations; Vacancy; Interstitial; Graphite; Diffusion; Coalescence
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Funding
- National Natural Science Foundation of China [10974119, 10705047]
- National Basic Research 973 Program of China [2005CB623602]
- Independent Innovation Foundation of Shandong University (IIFSDU) [2009JQ003]
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The study of dynamics of point defects in graphite is crucial for understanding the evolution of defect-induced ferromagnetism in C-12(+) irradiated graphite. In this work, we perform first-principles calculations to explore the diffusion and coalescence of vacancies and interstitials in graphite. Different kinds of point defects, such as monovacancy, divacancy, 'bridge' and 'Spiro' interstitials are considered using non-interacting and interacting models. The energetics, the diffusion paths, and the migration energies of these defects and the energy barriers for the reaction between these defects are predicted. The annealing behaviors of point defects and related ferromagnetism found in C-12(+) irradiated graphite are discussed. (c) 2010 Elsevier B.V. All rights reserved.
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