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arXiv 1906.07973cond-mat.mtrl-sci
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固体中缺陷速率方程模拟中对下沉强度的修正

Corrections to sink strengths used in rate equation simulations of defects in solids

Tommy Ahlgren, Kalle Heinola

摘要:

平均场速率方程已被证明是一种通用的方法,在模拟缺陷的动力学和材料的微观结构的时间变化。然而,该方法的可靠性和实用性严重依赖于所使用的缺陷相互作用参数。在这项研究中,我们表明,汇的强度也取决于脱陷或解离过程。缺陷被去除后的下沉强度比通常使用的值大得多。我们提出了一种如何确定适当的汇强度的理论,并表明,在某些情况下,如果忽略脱陷对汇强度参数的依赖性,速率方程方法会给出错误的结果。

英文摘要:

The mean-field rate equations have proven to be a versatile method in simulating defect dynamics and temporal changes in the micro-structure of materials. However, the reliability and usefulness of the method depends critically on the defect interaction parameters used. In this study, we show that the sink strength depends also on the detrapping or dissociation process. The sink strength for a defect that is detrapped, is much larger than the values usually used. We present a theory how to determine the appropriate sink strength, and show that the rate equation method, in some cases, gives wrong results if the detrapping dependence on the sink strength parameter is omitted.

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