HELIUM BUBBLES IN TUNGSTEN STUDIED BY POSITRON-ANNIHILATION

被引：24
|
作者：
SUBRAHMANYAM, VS
NAMBISSAN, PMG
SEN, P
机构：
[1] Saha Institute of Nuclear Physics, Calcutta, 700 064
来源：
SOLID STATE COMMUNICATIONS | 1994年 / 89卷 / 06期
关键词：
D O I：
10.1016/0038-1098(94)90749-8
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Positron lifetime and Doppler broadening measurements were made on uniformly helium-implanted tungsten to study the evolution of defects and helium bubbles during post-irradiation isochronal annealing. Helium decoration of loops gets enhanced below 500-degrees-C. Above 550-degrees-C helium gets dissociated from loops and the loops anneal out upon further annealing. Coarsening of helium-decorated vacancy clusters results in the formation of helium-filled voids, which upon annealing above 900-degrees-C transform into helium bubbles. The bubble parameters deduced from the positron lifetime data using a model analysis indicate the presence of overpressurized bubbles.
引用
收藏
页码：523 / 527
页数：5
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