Helium implanted CuHf as studied by TDPAC and positron lifetime measurements |
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Authors: | R Govindaraj G Venugopal Rao K P Gopinathan B Viswanathan |
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Institution: | (1) Materials Science Division, Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India;(2) Department of Physics, Cochin University of Science and Technology, 682 022 Cochin, India |
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Abstract: | 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. |
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Keywords: | TDPAC electric field gradient Hf solute clusters positron life-time helium-bubble |
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