Systematic study of He induced nano-fiber formation of W and other period 6 transition metals
Systematic study of He induced nano-fiber formation of W and other period 6 transition metals
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DOI：
10.1016/j.jnucmat.2018.04.024
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发表时间：
2018-12
影响因子：
3.1
通讯作者：
Y. Ueda;N. Yamashita;K. Omori;Heun Tae Lee;K. Ibano;A. Ito
中科院分区：
文献类型：
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作者：
Y. Ueda;N. Yamashita;K. Omori;Heun Tae Lee;K. Ibano;A. Ito
系统地研究了He等离子体辐照Ta、W、Re、Ir、Pt、Au等6种周期金属形成纳米纤维的过程。在相同的He等离子体辐照条件（通量、注量和离子能量）下，W、Re和Ir上均生成了长的纳米纤维，其中Re上的纳米纤维生长速率最高。另一方面，Ta、Pt和Au没有显示出长纳米纤维（在Pt上看到轻微的纳米纤维形成）。有利于纳米纤维形成的过渡金属是具有高杨氏模量和剪切模量的刚性材料。此外，刚性材料倾向于具有高的He结合能，在空位处具有He团簇。据推测，刚度可能有助于产生高应力场和高压He气泡的形成，这可能是重要的纳米纤维的形成。
Systematic study of nano-fiber formation by He plasma irradiation on period 6 metals (Ta, W, Re, Ir, Pt, Au) was performed. Under the same He plasma irradiation conditions (flux, fluence, and ion energy), long nano-fibers were produced on W, Re, and Ir among which the nano-fibers on Re had the highest growth rate. On the other hand, Ta, Pt and Au did not show long nano-fibers (slight nano-fiber formation was seen on Pt). The transition metals in favor of the nano-fiber formation are stiff materials with high Young's and shear moduli. In addition, stiff materials tend to have high He binding energies with He clusters at vacancies. It is speculated that stiffness could contribute to generation of high stress field and high pressure He bubble formation, which are possibly important for nano-fiber formation.