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arXiv 1409.1373cond-mat.mtrl-sci
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辐射损伤级联模拟中嵌入原子势非绝热效应的消除

Incorporating non-adiabatic effects in Embedded Atom potentials for radiation damage cascade simulations

Daniel Mason

摘要:

在辐射损伤级联位移尖峰中,离子和电子可以达到非常高的温度并且脱离热平衡。级联的正确建模与分子动力学应允许非绝热的离子和电子之间的能量交换使用一致的模型的电子停止,电子温度上升,和热传导的电子。我们提出了一个方案,用于纠正嵌入的原子势,这些非绝热性能的水平上的二阶矩近似,和bcc过渡金属的德拜温度以上的参数。我们在这里使用Finnis-Sinclair势和Derlet-Nguyen-Manh-Dudarev势作为成键模型,但从它们导出的修正可以应用于任何合适的经验势。

英文摘要:

In radiation damage cascade displacement spikes ions and electrons can reach very high temperatures and be out of thermal equilibrium. Correct modelling of cascades with molecular dynamics should allow for the non-adiabatic exchange of energy between ions and electrons using a consistent model for the electronic stopping, electronic temperature rise, and thermal conduction by the electrons. We present a scheme for correcting embedded atom potentials for these non-adiabatic properties at the level of the second-moment approximation, and parameterize for the bcc transition metals above the Debye temperature. We use here the Finnis-Sinclair and Derlet-Nguyen-Manh-Dudarev potentials as models for the bonding, but the corrections derived from them can be applied to any suitable empirical potential.

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