A comparison of interatomic potentials for modeling tungsten nanocluster structures

详细信息    查看全文

• 作者：Jiannan Hao ; Xiaolin Shu ; ^{shuxlin@buaa.edu.cn} ; Shuo Jin ; Xuesong Zhang ; Ying Zhang ; Guang-Hong Lu
• 关键词：Nanocluster ; Tungsten ; Interatomic potential ; Molecular dynamics
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：393
• 期：Complete
• 页码：180-185
• 全文大小：1662 K
• 卷排序：393

文摘

Molecular dynamic simulation is utilized to study the nanocluster and the fuzz structure on the PFM surface of tungsten. The polyhedral and linear cluster structures based on the icosahedron, cuboctahedron and rhombic dodecahedron are built up. Three interatomic potentials are used in calculating the relationship between the cluster energy and the number of atoms. The results are compared with first-principles calculation to show each potential’s best application scale. Furthermore, the transition between the icosahedral and the cuboctahedral clusters is observed in molecular dynamic simulation at different temperatures, which follows a critical curve for different numbers of atoms. The linear structures are proved to be stable at experimental temperatures by thermodynamics. The work presents a selection of interatomic potentials in simulating tungsten cluster systems and helps researchers understand the growth and evolution laws of clusters and the fuzz-like structure formation process in fusion devices.