Journal
MATERIALS RESEARCH LETTERS
Volume 2, Issue 1, Pages 43-50Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2013.841782
Keywords
Graphite; Irradiation; Topological Defects; Dislocations; Amorphization
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Funding
- DOE-NEUP program
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Using Raman and X-ray photoelectron spectroscopy, we delineate the bond and defect structures in nuclear block graphite (NBG-18) under neutron and ion irradiation. The strengthening of the defect (D) peak in the Raman spectra under irradiation is attributed to an increase in the topological, sp(2)-hybridized defects. Using transmission electron microscopy, we provide evidence for prismatic dislocations as well as a number of basal dislocations dissociating into Shockley partials. The non-vanishing D peak in the Raman spectra, together with a generous number of dislocations, even at low irradiation doses, indicates a dislocation-mediated amorphization process in graphite.
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