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arXiv 1707.05765cond-mat.mtrl-sci
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刚性晶格表面扩散的迁移势垒:挑战与解决方案

Migration barriers for surface diffusion on a rigid lattice: challenges and solutions

Ekaterina Baibuz, Simon Vigonski, Jyri Lahtinen, Junlei Zhao, Ville Jansson, Vahur Zadin, Flyura Djurabekova

摘要:

原子刚性晶格动力学蒙特卡罗是一种有效的模拟纳米物体和表面的方法,其时间尺度远长于分子动力学。然而,构建任何动力学蒙特卡罗模型的一个费力的部分是计算所有迁移势垒,这些势垒需要给出模拟中发生任何原子跳跃事件的概率。计算势垒的常用方法之一是微移弹性带法。完全描述模拟系统所需的障碍数量通常在数十万到数百万之间。计算如此大量的各种过程的障碍是远远不够的。在本文中,我们将讨论在表面上的障碍计算过程中出现的挑战,并提出了一个系统的和可靠的拴系力的方法来构建一个刚性的晶格障碍参数化的面心和体心立方金属晶格。我们已经产生了几个不同的障碍集铜和铁,可用于KMC模拟过程中任意粗糙表面。这些数据集以Data in Brief文章的形式发布,可供使用。

英文摘要:

Atomistic rigid lattice Kinetic Monte Carlo is an efficient method for simulating nano-objects and surfaces at timescales much longer than those accessible by molecular dynamics. A laborious part of constructing any Kinetic Monte Carlo model is, however, to calculate all migration barriers that are needed to give the probabilities for any atom jump event to occur in the simulations. One of the common methods of barrier calculations is Nudged Elastic Band. The number of barriers needed to fully describe simulated systems is typically between hundreds of thousands and millions. Calculations of such a large number of barriers of various processes is far from trivial. In this paper, we will discuss the challenges arising during barriers calculations on a surface and present a systematic and reliable tethering force approach to construct a rigid lattice barrier parameterization of face-centred and body-centred cubic metal lattices. We have produced several different barrier sets for Cu and for Fe that can be used for KMC simulations of processes on arbitrarily rough surfaces. The sets are published as Data in Brief articles and available for the use.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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