QUASI-ELASTIC LIGHT-SCATTERING IN SUPERIONIC GLASSES AGI-AG2O-M0O3

Quasielastic light scattering (QELS) due to hopping of Ag+ ions was st udied on superionic glasses (AgI)x(Ag2OMoO3)1-x (x = 0.60,0.70,0.75). The temperature dependence of the QELS intensity at a fixed frequency as well as the integrated QELS intensity were measured. The activation energy for ionic hopping did not depend on glass composition, and the value (almost-equal-to 0. 1 eV) was close to that determined in alpha -AgI. From these results, it was concluded that the local hopping of A g+ ions in the region like alpha-AgI contributes to QELS. It was found from the temperature dependence of the QELS intensity that the concen tration of hopping ions increased with increasing temperature above 22 0 K. The increase in hopping-ion concentration may be related to a dc conduction process.