A Gorsky relaxation associated with the long-range diffusion of hydrogen has been observed for the first time in a metallic glass. The diffusion parameters for amorphous ${\mathrm{Pd}}_{80}$${\mathrm{Si}}_{20}$ are $Q_D=0.25\mathrm{}$ eV and $D_0=0.003\mathrm{}$ ${\mathrm{cm}}^2$/sec. From the characteristics of a complementary reorientation relaxation, it is concluded that the interstitial sites occupied by hydrogen possess a distinctly asymmetric character.

• Received 20 March 1981

DOI:https://doi.org/10.1103/PhysRevB.24.2299