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Abstract
Nb 100 − x V x H y 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 Nb 95V 5H y , Nb 90V 10H y and Nb 50V 50H y 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 Nb 4V 2 octahedral and NbV 3 tetrahedral sites.
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