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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/020/04/0475-0479

    • Keywords

       

      Hydrogen-vacancy complex; electric field gradient; defect recovery

    • 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.

    • Author Affiliations

       

      R Govindaraj1 K P Gopinathan1

      1. Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, India

    • Dates

       
      Published
      July 1997

  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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