The zener relaxation as a distribution of relaxation times

Abstract

Most relaxation processes are not describable in terms of a single relaxation time, but require the introduction of a distribution of relaxation times. To obtain complete information about a relaxation process, it is important to know something about the functional form of the distribution and its width (the "distribution parameter"). In the present work this type of information is sought for the Zener relaxation in an Ag-30% Zn alloy. It is first shown that the form of the distribution function is difficult to determine, because the distribution is so narrow; however, a lognormal distribution is assumed as most reasonable. Next, the distribution parameter is obtained as a function of 1 T by using creep data as well as internal friction at various frequencies. The results indicate that a major part of the distribution of relaxation times is due to a distribution of the activation energies. Finally, an attempt is made to interpret the distribution of activation energies in terms of local concentration fluctuations in the solid solution. © 1962.