Abstract
Internal friction of amorphous Pd80Si20 metal doped with hydrogen or deuterium was measured with a specially designed apparatus using amorphous metal sheet as a part of the electric oscillating circuit. Two peaks in Q−1 curve are observed. Applying the peak shift method to the first “Snoek-like” peak, we can determine the relaxation time from which the microdiffusion coefficient can be calculated. The obtained microdiffusion coefficient is about 10−14 m2/s at 200 K, being comparable with the macrodiffusion coefficient obtained from the releasing method. It can, however, not elucidate the hydrogen isotopic effect on the peak temperature of Q−1 curve, the activation energy for relaxation and the relaxation time from the present work because of the broadness of obtained Q−1 curve.
