LATTICE DYNAMICS AND IONIC MOTION IN SUPERIONIC CONDUCTORS.

Abstract

The full dynamics of ionic motion including the host lattice offers insights into fast ionic diffusion in solids, which contains three characteristic times or frequencies. The investigation proceeds as follows: First, the frequency dependent conductivity sigma ( omega ) of a particle in a periodic potential is calculated and compared with corresponding experimental results on alpha -AgI and liquid AgI. Next, the effects of a lattice polarizability on particle motion are included and shown to account for the experimentally observed structure at about 10 cm** minus **1 in alpha -AgI. Finally, studies of sigma ( omega ) in the millimeter and microwave range are shown to yield detailed and complete information on correlated jumps and their time scales.