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

页码：523 / 527

页数：5

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