Abstract
Hydrogen diffusion in C15ZrTi 2H 3.7 has been measured in the temperature range 230 K to 450 K by means of pulsed-field-gradient nuclear magnetic resonance. The temperature dependence of the diffusivity shows an Arrhenius behavior, D = D 0· exp(− H a k BT ) , with an activation enthalpy H a = 0.22 eV and a pre-exponential factor D 0 = 1.8 · 10 −8 m 2 s −1. These results are in good agreement with the values derived from the proton spin-lattice relaxation rate Γ 1 measured on the same sample. Comparison of the results on D and Γ 1 yields additional information on the mechanisms of hydrogen diffusion. This permits distinction between long-range diffusion and localized motion.
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