Helium implanted CuHf as studied by TDPAC and positron lifetime measurements

Citation
R. Govindaraj et al., Helium implanted CuHf as studied by TDPAC and positron lifetime measurements, PRAMANA-J P, 52(2), 1999, pp. 219-233
Citations number
28
Categorie Soggetti
Physics
Journal title
PRAMANA-JOURNAL OF PHYSICS
ISSN journal
03044289 → ACNP
Volume
52
Issue
2
Year of publication
1999
Pages
219 - 233
Database
ISI
SICI code
0304-4289(199902)52:2<219:HICASB>2.0.ZU;2-G
Abstract
Ta-181 time differential perturbed angular correlation (TDPAC) and positron lifetime measurements were carried out on homogeneously alpha-implanted Cu Hf samples. TDPAC measurements indicate the trapping of vacancy clusters an d helium associated defect complexes by Hf atoms. The presence of helium-va cancy complexes and helium stabilised voids has been identified by positron lifetime measurements. Further the nucleation and growth stages of helium bubbles have been identified. TDPAC and positron lifetime measurements indi cate that Hf atoms act as heterogeneous nucleating centers for helium bubbl es. Hf atoms are found to suppress the bubble growth in CuHf as indicated b y the results of positron lifetime measurements.