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R Govindaraj
Articles written in Bulletin of Materials Science
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Volume 20 Issue 4 July 1997 pp 475-479
181Ta TDPAC studies in proton implanted Nb
Time differential perturbed angular correlation (TDPAC) measurement performed on the 482 keV level of181Ta probe nuclei in
p -implantedNb Hf sample shows that hydrogen decorated vacancy complexes are trapped by 6% of probe nuclei experiencing a Lorentzian distribution of quadrupole frequencies with a width of 32 MHz having a mean value of 545 ± 10 MHz with an asymmetry parameter 0·32. Measurements at RT following isochronal annealing treatment of the sample shows that the onset of detrapping of H-V complexes from probe nuclei occurs at 373 K and gets completed at 573 K. Hydrogen atoms stabilized vacancy clusters are found to be trapped by probe nuclei. The role played by other gaseous impurities in the sample in stabilizing the lattice defects bound to probe nuclei is discussed, to have a complete understanding of the recovery of defects in the sample. -
Volume 21 Issue 5 October 1998 pp 427-431 Positron Annihilation Studies
Cold-worked and hydrogen charged
Nb Hf as studied by TDPAC and positron lifetime measurementsR Govindaraj R Rajaraman K P Gopinathan B Viswanathan
Time differential perturbed angular correlation (TDPAC) and positron life-time measurements on cold-worked and hydrogen charged
Nb Hf indicate a strong binding of hydrogen decorated vacancy clusters with Hf impurities. Both TDPAC and positron lifetime results are mutually consistent on this aspect. Transformation of H-vacancy clusters into H-bubbles is indicated by the positron lifetime behaviour at annealing temperatures beyond 900 K. Impurity effects like oxygen pickup and coating of voids cannot be ruled out at elevated temperatures.
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Bulletin of Materials Science
Volume 45, 2022
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Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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