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 been carried out using X-ray absorption spectroscopy, anomalous wide angle 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 distribution of the Ag+ cations in the glassy matrix. This improved understanding of the local and medium range order has allowed a discussion of the validity of the various structural models suggested to explain the ionic transport process at the atomic level. This process cannot be explained by a phase-separation model but by correlated Ag+ jumps promoted by their large variety of sites.