Abstract
Nb100 − xVxHy is a random b.c.c. alloy with a hydrogen sublattice disordered with respect to site energies. We have determined the energetically most favourable hydrogen sites by means of neutron vibrational spectroscopy, which is a powerful tool for this purpose when the translational symmetry is strongly reduced. In Nb95V5Hy, Nb90V10Hy and Nb50V50Hy both octahedral and tetrahedral site occupation was observed. On the basis of spectroscopic and statistical arguments we assign the low temperature vibrational peaks in the niobium-rich NbVH alloys at low hydrogen content to Nb4V2 octahedral and NbV3 tetrahedral sites.
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