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Raman Spectroscopy for Quantitative Analysis of Point Defects and Defect Clusters in Irradiated Graphite
Author
Source
International Journal of Spectroscopy
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-02-08
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
We report the development of Raman spectroscopy as a powerful tool for quantitative analysis of point defect and defect clusters in irradiated graphite.
Highly oriented pyrolytic graphite (HOPG) was irradiated by 25 keV He+ and 20 keV D+ ions.
Raman spectroscopy and transmission electron microscopy revealed a transformation of irradiated graphite into amorphous state.
Annealing experiment indicated a close relation between Raman intensity ratio and vacancy concentration.
The change of Raman spectra under irradiation was empirically analyzed by “disordered-region model,” which assumes the transformation from vacancy-contained region to disordered region.
The model well explains the change of Raman spectra and predicts the critical dose of amorphization, but the nature of the disordered region is unclear.
Then, we advanced the model into “dislocation accumulation model,” assigning the disordered region to dislocation dipole.
Dislocation accumulation model can simulate the irradiation time dependencies of Raman intensity ratio and the c-axis expansion under irradiation, giving a relation between the absolute concentration of vacancy and Raman intensity ratio, suggesting an existence of the barrier on the mutual annihilation of vacancy and interstitial.
American Psychological Association (APA)
Niwase, Keisuke. 2012. Raman Spectroscopy for Quantitative Analysis of Point Defects and Defect Clusters in Irradiated Graphite. International Journal of Spectroscopy،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-453815
Modern Language Association (MLA)
Niwase, Keisuke. Raman Spectroscopy for Quantitative Analysis of Point Defects and Defect Clusters in Irradiated Graphite. International Journal of Spectroscopy No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-453815
American Medical Association (AMA)
Niwase, Keisuke. Raman Spectroscopy for Quantitative Analysis of Point Defects and Defect Clusters in Irradiated Graphite. International Journal of Spectroscopy. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-453815
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-453815