Segregation of atoms in Ni_xPd_y alloys during ion irradiation

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• 作者：V.I. Shulga
• 关键词：Sputtering ; Angular distribution ; Surface segregation ; NiPd alloys ; Computer simulation
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：2008
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：March 2008
• 卷：266
• 期：6
• 页码：949-954
• 文件大小：158 K

摘要

Sputtering of Ni₅Pd and NiPd₅ alloys by 10 keV Ar ions has been studied using the binary-collision simulation. Special attention was given to the angular distributions of sputtered atoms at the steady-state conditions. The results of simulations were compared with the experimental data published recently. For both targets, the concentrations of Ni and Pd atoms in the top monolayer were extracted from the experimental data. The results of simulations favor segregation of Pd in Ni₅Pd and segregation of Ni in NiPd₅. The total concentration of surface vacancies was found to be about 10–30%.