Total Structural Energy of Top-Site-Adsorbed CO/Nix-CU1-x Systems |
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引用本文: | 张辉,张国英,李星.Total Structural Energy of Top-Site-Adsorbed CO/Nix-CU1-x Systems[J].中国物理快报,2005,22(3):675-677. |
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作者姓名: | 张辉 张国英 李星 |
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作者单位: | CollegeofPhysicalScienceandTechnology,ShenyangNormalUniversity,Shenyang110034 |
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摘 要: | We construct an atomic group model of the disordered binary alloy Nix-Cu1-x for the cases that the surface composition segregation exists or not. According the model, we calculate the electronic structure in a top site of Nix-Cu1-x alloy surface by using the recursion method when CO absorbed on the Nix-Cu1-x surface under the condition of coverage 0.5. The calculation result indicates that chemical absorption of CO reduces the density of states of the disordered binary alloy Nix-Cu1-x, widens the energy band, and strengthens the covalent bonds between the d electron of Ni and s or p electron of CO. Chemisorption of CO inhibits the enrichment of atom Cu on the alloy surface especially when bulk Ni Concentration x is less than 0.8.
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关 键 词: | 结构能量 二元金属合金 能量带 原子群模型 电子结构 |
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