HYDROGEN CONCENTRATION-DEPENDENCE IN THE H-1 SPIN-LATTICE RELAXATION DUE TO MOTION IN AMORPHOUS NI0.33ZR0.67HX

The motion of hydrogen in the amorphous metal Ni0.33Zr0.67Hx has been studied using nuclear magnetic resonance for 0.25 less than or equal t o x greater than or equal to 1.45 over a temperature range of 170K to 440K. For fixed H-1 NMR frequency, the temperature of the motionally i nduced spin-lattice relaxation rate peak is a non-monotonic function o f x. The motion appears fastest at low and high concentrations and slo west for x=0.85. Pulsed field gradient measurements of the diffusion c onstant show that the measured relaxation is due to long-ranged motion .