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Title: Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation

Abstract

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, sp2-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.

Authors:
 [1];  [1];  [2];  [1]
  1. North Carolina State University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1110959
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Materials Research Letters
Additional Journal Information:
Journal Volume: 1; Journal Issue: 2; Journal ID: ISSN 2166--3831
Country of Publication:
United States
Language:
English
Subject:
graphite; radiation damage

Citation Formats

Eapen, Dr. Jacob, Krishna, Dr Ram, Burchell, Timothy D, and Murty, Prof K.L. Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation. United States: N. p., 2014. Web. doi:10.1080/21663831.2013.841782.
Eapen, Dr. Jacob, Krishna, Dr Ram, Burchell, Timothy D, & Murty, Prof K.L. Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation. United States. https://doi.org/10.1080/21663831.2013.841782
Eapen, Dr. Jacob, Krishna, Dr Ram, Burchell, Timothy D, and Murty, Prof K.L. 2014. "Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation". United States. https://doi.org/10.1080/21663831.2013.841782.
@article{osti_1110959,
title = {Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation},
author = {Eapen, Dr. Jacob and Krishna, Dr Ram and Burchell, Timothy D and Murty, Prof K.L.},
abstractNote = {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, sp2-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.},
doi = {10.1080/21663831.2013.841782},
url = {https://www.osti.gov/biblio/1110959}, journal = {Materials Research Letters},
issn = {2166--3831},
number = 2,
volume = 1,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2014},
month = {Wed Jan 01 00:00:00 EST 2014}
}