CORRELATION BETWEEN THE STRUCTURE OF (1-Y)GES2-CENTER-DOT-YAG(2)S GLASSES AND THEIR IONIC-CONDUCTIVITY

The structural analysis of (1 - y)GeS2 . yAg(2)S ternary glasses has b een carried out using X-ray absorption spectroscopy, anomalous wide an gle X-ray scattering and small angle X-ray scattering. All the results are consistent among themselves, and a combined analysis has provided straightforward structural conclusions about the homogeneous distribu tion of the Ag+ cations in the glassy matrix. This improved understand ing of the local and medium range order has allowed a discussion of th e validity of the various structural models suggested to explain the i onic transport process at the atomic level. This process cannot be exp lained by a phase-separation model but by correlated Ag+ jumps promote d by their large variety of sites.