Nuclear-Magnetic-Resonance Study of Hydrogen Alloying in the Early Transition Metals (Group VB)

Abstract

The Knight shifts and spin-lattice relaxation times of vanadium and niobium in the $\mathrm{V}{\mathrm{H}}_x$ and $\mathrm{Nb}{\mathrm{H}}_x$ systems, respectively, have been measured. From the observed relaxation-time temperature dependence, the contribution of the conduction electrons to the nuclear relaxation was found. A comparison of the Knight shifts and the relaxation times of V and Nb in the hydrides with those in the corresponding alloys, $\mathrm{V}{\mathrm{Cr}}_x$ and $\mathrm{Nb}{\mathrm{Mo}}_x$, shows great similarity. We have drawn some conclusions about this similarity. Using a Korringa-type relation for Nb in the $\mathrm{Nb}{\mathrm{H}}_x$ system, we learn about the type of conduction electrons giving rise to the Knight shift and relaxation rate.