Ionic Conduction in Glass: New Information on the Interrelation between the “Jonscher Behavior” and the “Nearly Constant-Loss Behavior” from Broadband Conductivity Spectra

We analyze broadband ac conductivity spectra of various ion conducting glasses with regard to the composition dependence of the "Jonscher behavior" and of the "nearly constant-loss behavior." In the temperature range of our experiments (173 K< or =T< or =573 K), both types of behavior are closely related, indicating that both arise from ion hopping. However, the "nearly constant-loss behavior" observed at temperatures below 100 K seems to be caused by other dynamic processes.