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Title: Formation of carbon nanostructures in nuclear graphite under high-temperature in situ electron-irradiation

Abstract

Defect evolution in nuclear graphite has been studied in real time using high-temperature in situ transmission electron microscopy. In situ electron-irradiation was conducted at 800 °C on a 200 kV transmission electron microscope with a dose rate, given in terms of displacements per atom per second, of approximately 1.46 × 10 –3 dpa/s. Defect domains consisting of ordered arrangements of pentagons, hexagons, and heptagons exist intrinsically in nuclear graphite and in addition are readily produced via electron-irradiation; however, at elevated temperatures these defect domains undergo atomic rearrangements resulting in the formation of carbon nanostructures via curling and closure of the basal planes. The formation of fullerenes and other structures due to thermal annealing or high-temperature electron-irradiation has been observed in disordered regions of the microstructure and interstitially between basal planes. Furthermore, these defect structures result in localized swelling and expansion of crystallites along the c axis; thus, it is proposed as one of the many atomic mechanisms involved in the dimensional change of nuclear graphite subjected to high-temperature irradiation.

Authors:
 [1];  [1]; ORCiD logo [2];  [2];  [1]; ORCiD logo [1]
  1. Boise State Univ., Boise, ID (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Boise State Univ., Boise, ID (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1487437
Grant/Contract Number:  
SC0016427
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 143; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nuclear graphite; electron irradiation; transmission electron microscopy

Citation Formats

Johns, Steve, Poulsen, Tyler, Kane, Joshua J., Windes, William E., Ubic, Rick, and Karthik, Chinnathambi. Formation of carbon nanostructures in nuclear graphite under high-temperature in situ electron-irradiation. United States: N. p., 2018. Web. doi:10.1016/j.carbon.2018.11.077.
Johns, Steve, Poulsen, Tyler, Kane, Joshua J., Windes, William E., Ubic, Rick, & Karthik, Chinnathambi. Formation of carbon nanostructures in nuclear graphite under high-temperature in situ electron-irradiation. United States. doi:10.1016/j.carbon.2018.11.077.
Johns, Steve, Poulsen, Tyler, Kane, Joshua J., Windes, William E., Ubic, Rick, and Karthik, Chinnathambi. Thu . "Formation of carbon nanostructures in nuclear graphite under high-temperature in situ electron-irradiation". United States. doi:10.1016/j.carbon.2018.11.077.
@article{osti_1487437,
title = {Formation of carbon nanostructures in nuclear graphite under high-temperature in situ electron-irradiation},
author = {Johns, Steve and Poulsen, Tyler and Kane, Joshua J. and Windes, William E. and Ubic, Rick and Karthik, Chinnathambi},
abstractNote = {Defect evolution in nuclear graphite has been studied in real time using high-temperature in situ transmission electron microscopy. In situ electron-irradiation was conducted at 800 °C on a 200 kV transmission electron microscope with a dose rate, given in terms of displacements per atom per second, of approximately 1.46 × 10–3 dpa/s. Defect domains consisting of ordered arrangements of pentagons, hexagons, and heptagons exist intrinsically in nuclear graphite and in addition are readily produced via electron-irradiation; however, at elevated temperatures these defect domains undergo atomic rearrangements resulting in the formation of carbon nanostructures via curling and closure of the basal planes. The formation of fullerenes and other structures due to thermal annealing or high-temperature electron-irradiation has been observed in disordered regions of the microstructure and interstitially between basal planes. Furthermore, these defect structures result in localized swelling and expansion of crystallites along the c axis; thus, it is proposed as one of the many atomic mechanisms involved in the dimensional change of nuclear graphite subjected to high-temperature irradiation.},
doi = {10.1016/j.carbon.2018.11.077},
journal = {Carbon},
issn = {0008-6223},
number = C,
volume = 143,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 29, 2019
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