, Volume 52, Issue 2, pp 219–233 | Cite as

Helium implanted CuHf as studied by TDPAC and positron lifetime measurements

  • R Govindaraj
  • G Venugopal Rao
  • K P Gopinathan
  • B Viswanathan


181Ta time differential perturbed angular correlation (TDPAC) and positron lifetime measurements were carried out on homogeneously α-implanted CuHf samples. TDPAC measurements indicate the trapping of vacancy clusters and helium associated defect complexes by Hf atoms. The presence of helium-vacancy 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 indicate that Hf atoms act as heterogeneous nucleating centers for helium bubbles. Hf atoms are found to suppress the bubble growth in CuHf as indicated by the results of positron lifetime measurements.


TDPAC electric field gradient Hf solute clusters positron life-time helium-bubble 


81.40 82.20 


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Copyright information

© Indian Academy of Sciences 1999

Authors and Affiliations

  • R Govindaraj
    • 1
  • G Venugopal Rao
    • 1
  • K P Gopinathan
    • 1
    • 2
  • B Viswanathan
    • 1
  1. 1.Materials Science DivisionIndira Gandhi Centre for Atomic ResearchKalpakkamIndia
  2. 2.Department of PhysicsCochin University of Science and TechnologyCochinIndia

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