HIGH-TEMPERATURE H-1 SPIN-SPIN RELAXATION IN ZR-NI-CU-H AMORPHOUS-ALLOYS

H-1 spin-spin relaxation time (T-2) and complementary hydrogen content , PMR spectrum width and spin-lattice relaxation time (T-1) have been measured in Zr-y(Ni1-xCux)(1-y)-H ternary amorphous alloys of differen t hydrogen content at 0 less than or equal to x less than or equal to 33 at.% Cu and y=33, 50 and 67 at.% Zr concentrations using Carr-Purce ll-Meiboom-Gill (CPMG), solid-echo and saturation recovery pulse seque nces, respectively. At high hydrogen contents the T-2 measured by the slope of the CPMG echo train depends on both the Zr and Cu content, bu t is independent of the hydrogen content. The differences in the spin- spin relaxation behaviours can be attributed to the substantial change of correlation time and not to the change of activation energy or loc al fields. The measurements were made in the ''motional narrowing'' st ate, consequently our E-a and (tau infinity) quantities are averaged t o the diffusion motion of protons taking part in this process. At smal l hydrogen contents T-2 depends on hydrogen content and the T-2 vs. 1/ T curves cannot be fitted by single Arrhenius plots. The hydrogen cont ent measured by echo train has turned out to be systematically smaller than that measured by weight increase, demonstrating that not all the hydrogen takes part in the diffusion process.