Embedded atom method interatomic potentials fitted upon density functional theory calculations for the simulation of binary Pt Ni nanoparticles

Embedded atom method interatomic potentials fitted upon density functional theory calculations for the simulation of binary Pt Ni nanoparticles
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嵌入原子法原子间势适合密度泛函理论计算,用于模拟二元 Pt Ni 纳米粒子

DOI:
10.1016/j.commatsci.2017.03.020
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发表时间:
2017
影响因子:
3.3
通讯作者:
Symianakis E
Symianakis E
中科院分区:
材料科学3区
文献类型:
--
作者:
Symianakis E

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基于密度泛函理论(DFT)的总能量计算,嵌入原子法(EAM)电位已被拟合用于小的,~ 2-5 nm,二元,pt单键ni纳米颗粒的原子模拟。DFT计算的总体质量和最终势是通过独立计算纯金属和稳定合金的一系列性质得到的,这些性质通常用于原子间电位的拟合。拟合电位模拟纳米结构的能力通过复制厚度为~ 1nm的二元纳米板和极端情况下直径为~ 0.6 nm的最小二十面体纳米板来评估。所使用的方法需要高质量的收敛,但由于它基于静态总能量计算,因此DFT成本较低。它还为拟合过程中对拟合电位的评价提供了客观标准,并已用开源代码GULP实现。
Embedded Atom Method (EAM) potentials have been fitted for the atomistic simulation of small, ∼2–5 nm, binary, Ptsingle bondNi, nanoparticles completely from Density Functional Theory (DFT) total energy calculations. The overall quality of the DFT calculations and the final potential is obtained through the independent calculation of an array of properties of the pure metals and the stable alloys, which are normally used for the fitting of interatomic potentials. The ability of the fitted potentials to simulate nanostructures is evaluated by the reproduction of binary nanoslabs with thickness ∼1 nm, and nanoparticles in the extreme case of the smallest icosahedrons possible, with diameter ∼0.6 nm. The used approach requires high quality of convergence but otherwise low cost DFT as it is based on static total energy calculations. It also provides objective criteria for the evaluation of the fitted potentials during fitting and has been implemented with the open source code GULP.
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