Point defect movement and annealing in collision cascades
Point defect movement and annealing in collision cascades
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DOI：
10.1103/physrevb.56.2421
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发表时间：
1997-08
影响因子：
3.7
通讯作者：
K. Nordlund;R. Averback
中科院分区：
文献类型：
--
作者：
K. Nordlund;R. Averback
通过模拟金、铜、铝、铂和硅中的5 keV碰撞级联，研究了碰撞级联对晶体材料中预先存在的点缺陷的影响。结果表明，碰撞级联并没有显着影响级联的液芯外的杂质或空位，虽然在fcc金属中，由于级联晶体的加热导致一些杂质的热迁移。在液态叶栅核心内，当熔体再凝固并在那里重新组合或聚集时，晶体和空位都向熔体区域的中心移动。在升高的温度下，在热尖峰阶段期间的杂质的随机跳跃可导致在液体中的杂质的显著额外捕获。与面心立方金属中已有损伤的退火效应相反，在硅中，由级联产生的新损伤的量大致与初始点缺陷的数量无关。这种差异归因于材料中的粘合性质。{版权} {美国物理学会}
The effect of collision cascades on preexisting point defects in crystalline materials was studied by simulating 5 keV collision cascades in gold, copper, aluminum, platinum, and silicon. The results indicate that collision cascades do not significantly affect interstitials or vacancies outside the liquid core of the cascade, although in the fcc metals the heating of the crystal due to the cascade causes some thermal migration of the interstitials. Within the liquid cascade core, both interstitials and vacancies move towards the center of the molten region when it resolidifies and recombine or cluster there. At elevated temperatures, random jumps of interstitials during the thermal-spike phase can cause significant additional trapping of interstitials in the liquid. In contrast to the annealing effects of preexisting damage in the fcc metals, in silicon the amount of new damage created by a cascade is roughly independent of the number of initial point defects. The difference is attributed to the nature of the bonding in the materials. {copyright} {ital 1997} {ital The American Physical Society}