AC conductivity of Bi-Sr-Ca-Cu-O glasses

The results of AC electric conductivity measurements in Bi-Sr-Ca-Cu-O glasses are reported. Two components of the total conductivity were observed, and the activation energies of both processes was determined. Small polaron hopping between copper ions in a different valency state Cu/sup I/-Cu/sup I/I is one process. We believe that the second conductivity component is Cu/sup I/ ion diffusion.