Interaction between Interstitial Hydrogen and Fe Atoms within the β-Hydride Phase in Nb1−yFeyHx Alloys: Proceedings of the 27th International Conference on the Applications of the Mössbauer Effect (ICAME 2003) Muscat, Oman, 21–25 September, 2003 (Guest Editors: M. E. Elzain, A. A. Yousif, A. D. Al Rawas and A. M. Gismelseed)

Author: Brzeska-Michalak B.   Ostrasz A.  

Publisher: Springer Publishing Company

ISSN: 0304-3843

Source: Hyperfine Interactions, Vol.156, Iss.1, 2004-06, pp. : 137-142

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Abstract

The influence of hydrogen on the electronic and structural properties of Nb1−yFey alloys has been studied with 57Fe Mössbauer spectroscopy and X-ray diffraction. The results clearly indicate the β-NbHx hydride formation in place of α-Nb phase. The quadrupole splitting and the isomer shift of β-hydride subspectrum have been considered in terms of interaction between the interstitials and the Mössbauer atoms within the hydride phase. We show that in disordered non-stoichiometric β-hydride formed in Nb1−yFeyHx alloy the Fe atoms can be really treated as probes that are sensitive to the change of the hydride sublattice configuration. The results indicate that the hydrogen-induced isomer shift relative to the unloaded alloys can be used as a measure of the mean number of hydrogen atoms next to the Fe probes. Both, the isomer shift and the quadrupole splitting indicate a configuration with three hydrogen atoms as nearest neighbours of Fe captured in β-hydride sublattice in Nb(0.985÷0.90)Fe(0.015÷0.10)Hx alloys.

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