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Structure and dynamics of liquid Al1−xSix alloys by ab initio molecular dynamics simulations |
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| Authors: | Songyou Wang C.Z. Wang K.M. Ho |
| Affiliation: | a Department of Optical Science and Engineering, State Key Laboratory for Advanced Photonic Materials and Devices, Fudan University, Handan road 220, Shanghai 200433, PR China b Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA c Department of Applied Physics, Hunan University, Changsha 410082, PR China |
| Abstract: | First-principles molecular dynamics (MD) simulations are performed to study the structure and dynamics of liquid Al1−xSix (x = 0.0, 0.12, 0.2, 0.4, 0.6, 0.8) at the temperature of 1573 K. The composition dependence of static structure factors, pair correlation functions, and diffusion constants are investigated. We found that the structure of the liquid Al1−xSix alloys is strongly dependent on the composition. From our simulation and analysis, we can see that although liquid Al1−xSix is metallic, there are some degrees of covalent tetrahedral short-range order in the liquid. The degree of tetrahedral short-range order increases linearly as the Si concentration in the liquid increased. The diffusion coefficients of both Al and Si atoms in liquid Al1−xSix alloys at 1573 K are not very sensitive to the composition. |
| Keywords: | 61.20.Ja 61.25.Mv 71.15.Pd |
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