Q-carbon as a new radiation-resistant material
Q-carbon as a new radiation-resistant material
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Q-碳作为新型抗辐射材料
DOI：
10.1016/j.carbon.2021.10.006
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发表时间：
2022
期刊：
影响因子：
10.9
通讯作者：
Narayan, R.J.
中科院分区：
文献类型：
--
作者：
Narayan, J.;Joshi, P.;Smith, J.;Gao, W.;Weber, W.J.;Narayan, R.J.
我们发现，Q-碳在包括极端原子位移和电子激发在内的离子辐照下具有极强的抗辐射损伤能力。用5 MeV的Au+离子辐照蓝宝石衬底上的Q-碳膜，剂量范围为3.3-10 dpa(每原子的位移)。离子辐照后，对原子结构和成键特性的详细研究表明，非晶态Q碳的原子结构和成键特性在辐照损伤10dpa时基本保持不变，相当于常规反应堆20多年的中子损伤。当剂量从3.3 dpa增加到10 dpa时，Q-碳层下面有一层离子束混合层，其厚度从5 nm增加到10 nm。发现这一层主要是无定形的，含有Al2O3和Al4C3的混合物。这一层是由于增强的前向散射和弹道离子束混合而形成的，其成分与详细的配平计算一致。我们还发现，镶嵌在Q-Carbon中的纳米金刚石(平均尺寸为3 nm)在6.6 dpa后生长到约60 nm，在10 dpa后缩小到约40 nm。讨论了非平衡离子辐照下金刚石亚稳相的生长和收缩机制。
We have discovered that Q-carbon is extremely resistant to radiation damage under ion irradiations involving extreme atomic displacements and electronic excitations. Using 5 MeV Au+ions, the Q-carbon films on sapphire substrates were irradiated in the dose range 3.3–10 dpa (displacements-per-atom). After the ion irradiations, detailed studies on the atomic structure and bonding characteristics showed that atomic structure and bonding characteristics of amorphous Q-carbon remained essentially unchanged to 10 dpa of radiation damage, which is equivalent to over twenty years of neutron damage in a conventional reactor. There was an ion-beam mixed layer below the Q-carbon layer, whose thickness increased from 5 nm to 10 nm, as the dose increased from 3.3 to 10 dpa. This layer was found to be mostly amorphous with a mixture Al2O3and Al4C3. This layer, formed as a result of enhanced forward scattering and ballistic ion beam mixing, exhibited composition consistent with detailed TRIM calculations. We also found that nanodiamonds (3 nm average size) embedded in Q-carbon grew to about 60 nm after 6.6 dpa and shrank to about 40 nm after 10 dpa. We discuss the mechanism for the growth and shrinkage of metastable phase of diamond under nonequilibrium ion irradiations.
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影响因子：
10.9
作者：
J. Narayan;A. Bhaumik;Siddharth Gupta;P. Joshi;P. Riley;R. Narayan
通讯作者：
J. Narayan;A. Bhaumik;Siddharth Gupta;P. Joshi;P. Riley;R. Narayan
影响因子：
15
作者：
Yanwen Zhang;W. J. Weber
通讯作者：
Yanwen Zhang;W. J. Weber
影响因子：
9.5
作者：
Sachan, Ritesh;Gupta, Siddharth;Narayan, Jagdish
通讯作者：
Narayan, Jagdish
Q-碳比金刚石还硬
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
J. Narayan;Siddharth Gupta;R. Sachan;A. Bhaumik;F. Cellini;E. Riedo
通讯作者：
E. Riedo
绝缘体基底中的离子束混合
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
C. McHargue
通讯作者：
C. McHargue