利用Materials Explorer分子动力学软件包,模拟研究了尺寸为0.5~15nm的Pb纳米薄膜的结合能和晶格参数的尺寸效应。研究表明,Pb纳米薄膜的结合能和晶格参数都随薄膜厚度的减小而降低,但降低的幅度要比同尺寸的Pb纳米团簇小。在模拟过程中,由于薄膜充分弛豫,模拟的结合能比SAD模型的计算结果要高一些。
The size dependent cohesive energy and lattice parameter of Pb nanofilms with size of 0. 5~15nm are studied by molecular dynamics simulation method, where the software used here is Materials Explorer. It is shown that the cohesive energy and the lattice parameter of Pb films decrease with decreasing the height of films, although the quantitative decreasing is lower than that of corresponding nanoclusters in the same size. Due to relaxation in molecular simulation, the present results on cohesive energy are higher than the predictions by SAD model.