Interaction between Interstitial Hydrogen and Fe Atoms within the β-Hydride Phase in Nb1−yFeyHx Alloys
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 a-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 nonstoichiometric β-hydride formed in Nb1−y Fe y H x 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)H x alloys.
Key wordsiron—niobium alloys niobium hydrides Mössbauer spectroscopy of 57Fe
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