Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-659-C8-662
Long-Range Diffusion of Hydrogen in Amorphous Cu50Ti50H. Mizubayashi and T. Ishii
Institute of Materials Science, University of Tsukuba, Tsukuba 305, Japan
The hydrogen Gorsky effects (HGE) measurements were carried out in amorphous Cu50Ti50, for which the data for the hydrogen Snoek peak (HSP) have been compiled. In the hydrogen concentration, CH, range below 1 at.%, the hydrogen diffusion process changes over from the short circuit mode to the detrapping mode with increasing CH and (λ)2 is much smaller than (trλ)2, where λ is the strain tensor around a hydrogen atom. For CH>1 at.%, the hydrogen diffusion proceeds by the detrapping mode. The whole hydrogen atoms contribute to the HGE although only hydrogen atoms sitting on the sites with G being nearly equal to µ contribute to the HSP, where G is the site energy and µ the chemical potential of hydrogen atoms. The results are expected as a dispersion in G is much larger than thermal energies and the nearest neighbor blocking for hydrogen occupation is the case. (λ)2 is much larger than , suggesting that one or two of (trλ)2, λ1,λ2 and λ3 is (are) negative for CH>1 at.%.
© EDP Sciences 1996