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Amorphization kinetics under swift heavy ion irradiation: A cumulative overlapping-track approach

机译:快速重离子辐照下的非晶化动力学:累积重叠轨迹法

摘要

A simple illustrative physical model is presented to describe the kinetics of damage and amorphization by swift heavy ions (SHI) in LiNbO3. The model considers that every ion impact generates initially a defective region (halo) and a full amorphous core whose relative size depends on the electronic stopping power. Below a given stopping power threshold only a halo is generated. For increasing fluences the amorphized area grows monotonically via overlapping of a fixed number N of halos. In spite of its simplicity the model, which provides analytical solutions, describes many relevant features of the kinetic behaviour. In particular, it predicts approximate Avrami curves with parameters depending on stopping power in qualitative accordance with experiment that turn into Poisson laws well above the threshold value. © 2010 Elsevier B.V. All rights reserved.
机译:提出了一个简单的说明性物理模型来描述LiNbO3中快速重离子(SHI)的破坏和非晶化动力学。该模型认为,每次离子碰撞最初都会产生一个缺陷区域(光晕)和一个完全非晶的核,其相对大小取决于电子停止功率。在给定的停止功率阈值以下,仅产生光晕。为了增加注量,非晶化区域通过固定数量N的光晕重叠而单调增长。尽管模型很简单,但它提供了分析解决方案,描述了动力学行为的许多相关特征。特别是,它定性地根据实验的定律预测了具有取决于停止功率的参数的近似Avrami曲线,该实验将泊松定律大大超过阈值。 ©2010 Elsevier B.V.保留所有权利。

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