On the possibility of universal interstitial emission induced annihilation in metallic nanostructures
On the possibility of universal interstitial emission induced annihilation in metallic nanostructures
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关于金属纳米结构中普遍的间隙发射诱导湮灭的可能性
DOI：
10.1016/j.jnucmat.2017.12.038
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发表时间：
2018-03
影响因子：
3.1
通讯作者：
Q.F. Fang
中科院分区：
文献类型：
--
作者：
Xiangyan Li;Yichun Xu;Guohua Duan;Jingjing Sun;Congyu Hao;Yange Zhang;Wei Liu;C.S. Liu;Q.F. Fang
纳米结构的金属已经被探索作为用于辐射损伤的自修复材料，所述辐射损伤是由于在界面处的空位-间隙复合，所述界面例如纳米晶体（NC）中的晶界（GB）和纳米多孔金属（NP）中的自由表面。最近提出铜的湮灭是通过GB的电子发射（IE）。然而，IE是否作为一种可能的通用机制应用于其他NP和NC值得进一步研究。间隙通常被认为克服与GB/表面的大结合能，以迁移出GB/表面并引起湮灭。在这项工作中，强调在钨的IE的间隙是非常紧密地结合到钨GB/表面，我们发现，间隙只需要迁移一个小的距离从GB/表面附近的空位在一个小的能量势垒重组。在此过程中，在GB/表面的静态间隙周围的湮灭区传播或扩展到相邻的体区域大大。湮灭被发现是通过IE从GB/表面或耦合的空位跳跃与IE。提出了间隙原子的间隙-GB/表面结合能与GB/表面的捕获半径的比值比结合能更好地定性指示IE中的困难。考虑到IE在所研究的NP和NC钨、铁和铜中起作用，其中不同构型的金属以不同水平与GB/表面结合，IE机制可以在各种纳米结构的金属中普遍起作用。
Nano-structured metals have been explored as self-healing materials for radiation damage due to vacancy-interstitial recombination at interfaces, such as grain boundaries (GBs) in nanocrystals (NCs) and free surfaces in nanoporous metals (NPs). The annihilation in copper was recently proposed to be via the interstitial-emission (IE) from the GB. However, whether the IE is applied as a possibly universal mechanism in other NPs and NCs deserves further investigation. The interstitial is often considered to overcome a large binding energy with the GB/surface to migrate out of the GB/surface and induce annihilation. In this work, with emphasis on the IE in tungsten where the interstitial is exceptionally tightly bound to the tungsten GB/surface, we found that the interstitial only needed to migrate over a small distance from the GB/surface to recombine with the vacancy nearby at a small energy barrier. During the process, the annihilation region around a static interstitial at the GB/surface propagated or extended greatly to the adjacent bulk area. The annihilation was found to be via the IE from the GB/surface or coupled vacancy hop with the IE. The ratio of the interstitial-GB/surface binding energy to the trapping-radius of the GB/surface for the interstitial was proposed to be a better qualitative indicator for the difficulty in the IE than the binding energy. Given that the IE works in the investigated NPs and NCs tungsten, iron and copper where the interstitials of distinct configurations bind with the GBs/surfaces at diverse levels, the IE mechanism may work universally in various nano-structured metals.
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影响因子：
8.6
作者：
Samaras, M;Derlet, PM;Victoria, M
通讯作者：
Victoria, M
表征辐照引起的点缺陷与 Fe、Mo 和 W 中几个倾斜对称晶界之间相互作用的主要物理参数
影响因子：
3.1
作者：
Xiangyan Li;Wei Liu;Yichun Xu;C.S. Liu;Q.F. Fang;B.C. Pan;Jun-Ling Chen;G.-N. Luo;Zhiguang Wang
通讯作者：
Zhiguang Wang
影响因子：
64.8
作者：
de la Rubia, TD;Zbib, HM;Caturla, MJ
通讯作者：
Caturla, MJ
影响因子：
4
作者：
Fu, E. G.;Caro, M.;Caro, A.
通讯作者：
Caro, A.
影响因子：
3.3
作者：
Borovikov, Valery;Tang, Xian-Zhu;Voter, Arthur F.
通讯作者：
Voter, Arthur F.