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Bulletin of Materials Science

, Volume 20, Issue 4, pp 475–479 | Cite as

181Ta TDPAC studies in proton implanted Nb

  • R Govindaraj
  • K P Gopinathan
Article

Abstract

Time differential perturbed angular correlation (TDPAC) measurement performed on the 482 keV level of181Ta probe nuclei inp-implantedNbHf 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.

Keywords

Hydrogen-vacancy complex electric field gradient defect recovery 

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References

  1. Hautojarvi P 1987Mater. Sci. Forum 15–18 619Google Scholar
  2. Pleiter F and Hohenemser C 1982Phys. Rev. B25 106Google Scholar
  3. Recknagel E, Schatz G and Wichert Th. 1983 inHyperfine interactions of radioactive nuclei (ed.) J Christiansen (Heidelberg: Springer Verlag)Google Scholar
  4. Rinneberg H, Semmler W and Antesberger G 1978Phys. Lett. A64 1, 57Google Scholar
  5. Thome L and Bernas H 1978Hyp. Int. 5 361CrossRefGoogle Scholar
  6. Wrede U, Schaefer T and Vianden R 1986Z. Phys. B64 461CrossRefGoogle Scholar

Copyright information

© the Indian Academy of Sciences 1997

Authors and Affiliations

  • R Govindaraj
    • 1
  • K P Gopinathan
    • 1
  1. 1.Materials Science DivisionIndira Gandhi Centre for Atomic ResearchKalpakkamIndia

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