论文标题
通过用快速重离子放牧发病率辐射Al2O3和MGO的表面纳米结构机制
Mechanisms of surface nanostructuring of Al2O3 and MgO by grazing incidence irradiation with swift heavy ions
论文作者
论文摘要
我们通过实验发现，当在带有23 MeV I梁的放射率下，Al2O3和MGO在辐射率下进行辐照时，在表面上表现出良好的纳米修饰，而在未发现相同的离子束的正常入射率相比，当没有发现损坏时。此外，这两种材料中的离子产生了显着不同的结构：在MGO表面上周围环绕的凹槽与Al2O3表面上的更平滑，类似侧面的不连续结构。为了解释这些结果，进行了详细的数值模拟。我们确定表面的存在抑制了重结晶过程，从而防止了瞬态轨道的恢复，从而形成了可观察到的纳米模式。此外，Al2O3与MGO中熔融状态的粘度的差异解释了创建的纳米结构的差异。因此，我们的结果为表面纳米结构的基本过程提供了更深入的了解，有可能允许受控的周期性表面纳米模式的产生。
We experimentally discovered that Al2O3 and MgO exhibit well-pronounced nanometric modifications on the surfaces when irradiated under grazing incidence with 23 MeV I beam, in contrast to normal incidence irradiation with the same ion beam when no damage was found. Moreover, ions in these two materials produce notably different structures: grooves surrounded with nanohillocks on MgO surfaces vs. smoother, roll-like discontinuous structures on the surfaces of Al2O3. To explain these results, detailed numerical simulations were performed. We identified that a presence of the surface inhibits recrystallization process, thereby preventing transient tracks from recovery, and thus forming observable nanopatterns. Furthermore, a difference in the viscosities in molten states in Al2O3 vs. MgO explains the differences in the created nanostructures. Our results thus provide a deeper understanding of the fundamental processes of surface nanostructuring, potentially allowing for controlled production of periodic surface nanopatterns.
