Experimental evidence for 'buckle, ruck and tuck' in neutron irradiated graphite. (15th April 2020)

• Record Type: Journal Article
• Authors: Johns, Steve; He, Lingfeng; Kane, Joshua J.; Windes, William E.; Ubic, Rick; Karthik, Chinnathambi
• Is Part Of: Carbon. Volume 159(2020)
• Page Start: 119
• Page End: 121
• Publication Date: 2020-04-15
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.12.028
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The current mainstream theory for radiation-induced dimensional change of nuclear graphite is based on the notion that interstitially displaced carbon atoms will coalesce into dislocation loops (i.e., additional basal planes). This standard atomic-displacement model has been challenged by theories based on first principles calculations. The so-called 'ruck and tuck' of basal planes has been proposed as an alternative mechanism to explain the observed c -axis expansion under irradiation; however, no such defects have been observed experimentally so far. In this study, the first experimental evidence for the presence of a 'ruck and tuck' defect in high-temperature neutron-irradiated nuclear graphite is presented.