The spin-lattice relaxation time of H in Ti3IrHx was deduced from pulsed nuclear magnetic resonance measurements which were carried out at temperatures of between 5 and 630K. Here, x was equal to 0.55, 3.0, or 3.5. The measured relaxation rates could be described by superposing the Korringa relaxation, and the dipolar relaxation which was due to H diffusion. The products of Korringa relaxation times and temperatures were equal to 87sK, 124sK and 145sK for x = 0.55, 3.0 and 3.5, respectively. The dipolar relaxation rates were analyzed and yielded the mean residence times of H at temperatures of between about 200 and about 500K. The mean residence time depended upon the H concentration. They could be described by an Arrhenius relationship with activation energies of 0.155eV (x = 0.55), 0.365eV (x = 3.0) and 0.265eV (x = 3.5).

D.Guthardt, D.Beisenherz, H.Wipf: Journal of Physics - Condensed Matter, 1992, 4[33], 6919-26

Table 298

Diffusion of Fe in -Ti-Fe Alloys