ANOMALOUS HELIUM-BUBBLE GROWTH IN PALLADIUM

被引：26
|
作者：
RAJARAMAN, R
VISWANATHAN, B
VALSAKUMAR, MC
GOPINATHAN, KP
机构：
[1] Materials Science Division, Indira Gandhi Centre for Atomic Research
来源：
PHYSICAL REVIEW B | 1994年 / 50卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.50.597
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Helium-bubble growth in alpha-implanted palladium has been investigated by positron-lifetime measurements as a function of isothermal annealing time, t. The bubble radius shows first an expected t1/6 variation and then an anomalous time dependence faster than t1. It is shown that a model based on surface-diffusion-controlled migration and coalescence, taking into account the dependence of bubble diffusivity on the time-varying helium density in the bubble and ledge nucleation, explains the observed behavior.
引用
收藏
页码：597 / 600
页数：4
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