Journal
APPLIED SURFACE SCIENCE
Volume 465, Issue -, Pages 1014-1018Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.09.174
Keywords
Interface; Strain gradient; He bubble distribution; Alleviation of radiation damage
Categories
Funding
- National Magnetic Confinement Fusion Energy Research Project from Ministry of Science and Technology of China [2015GB121004, 2017YFE0302500]
- Center for Integrated Nanotechnologies (CINT), a US DOE Office of Science
- Peking University
- National Natural Science and Foundation of China (NSFC) [11375018, 11528508]
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Interfaces are good traps for implanted He and radiation induced damage, and understanding the role of interfaces is important for designing highly radiation-resistant materials. In this article, Nb sheet and Nb film on MgO substrate (Nb/MgO) are irradiated by He ions, and it is found that the He bubble distribution along radiation depth between Nb sheet and Nb/MgO film is different. The comparison reveals that this difference is resulted from the diffusion of He atoms driven by strain gradient in Nb film close to Nb/MgO interface. This study could provide novel mechanisms for further understanding the interface enhancing radiation tolerance.
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