Ag adatom and dimer motion on Cu(1 1 0)(1 x 2) missing row surface

被引:12
作者
Sbiaai, Khalid [1 ]
Eddiai, Adil [1 ,2 ]
Boughaleb, Yahia [1 ,3 ,6 ]
Hajjaji, Abdelowahed [4 ]
Mazroui, M'hammed [3 ]
Kara, Abdelkader [5 ]
机构
[1] Univ Chouaib Doukkali, Fac Sci, Lab Phys Matiere Condensee, El Jadida, Morocco
[2] Inst Natl Sci Appl, LGEF, F-69621 Villeurbanne, France
[3] Univ Hassan II Mohammedia, Fac Sci Ben Msik, Lab Phys Matiere Condensee, Casablanca, Morocco
[4] Univ Chouaib Doukkali, Ecole Natl Sci Appl, El Jadida, Morocco
[5] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA
[6] Hassan II Acad Sci & Technol, Rabat, Morocco
关键词
Embedded adatom method; Molecular dynamics simulations; Diffusion; Small cluster; Copper; Silver; SELF-DIFFUSION; BROWNIAN PARTICLES; DYNAMICS; GROWTH; JUMPS; POTENTIALS; MECHANISM; METALS; COPPER; ATOMS;
D O I
10.1016/j.optmat.2013.06.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The diffusion of Ag monomer and dimer on Cu(1 1 0)(1 x 2) missing row reconstructed surface is investigated by using the molecular dynamics simulation based on semi-empirical many-body potentials derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long jump follow an Arrhenius law in a large temperature range (300-500 K) but with a small difference in activation energy. The activation barrier energy for simple jump is found to be (0.27 +/- 0.02) eV with corresponding prefactor 5.9 ps(-1). However, for double jump we found E-a2 = (0.33 +/- 0.05) eV. While in the case of dimer, we found that the adatoms activity is notably reduced at low temperature (T < 400 K) and the diffusion via dissociation-reassociation process is more favoured than the other processes. This finding is in a good agreement with the energetic prediction. The presence of concerted jump and leapfrog process is very rare due to their high corresponding activation energy. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:42 / 46
页数:5
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