Local hydrogen vibrations in Nb in the presence of interstitial (N,O) and substitutional (V) impurities
- 15 January 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 27 (2), 927-934
- https://doi.org/10.1103/physrevb.27.927
Abstract
We have measured the hydrogen vibrations in Nb , Nb , and Nb between 295 and 4 K. In the case of Nb , these spectroscopic measurements suggest a down shift of the phase boundary for H precipitation by about 30 K. At low temperatures we find excitations at 117 and 166 meV, which are characteristic of an ordered hydride phase. On the contrary, O or N interstitial defects totally suppress the precipitation of H due to trapping. The vibrational energies of H trapped by N (or O) are 106 (107) and 160 (163) meV, which are very close to energies measured for free H in Nb at 295 K. This clearly indicates that H atoms in these systems are trapped at relatively unperturbed tetrahedral-type sites. The peak shapes are distinctly different for the trapping and the nontrapping defects. Several mechanisms that can cause the large widths observed are discussed.
Keywords
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