J. Phys. IV France 02 (1992) C2-153-C2-158
FIC glasses based upon AgI-TlI eutecticB. TANGUY, J. PORTIER, S. ROSSIGNOL, J. M. REAU and J. J. VIDEAU
Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex, France
New vitreous conductors, shown in the TeO2-Tl2O-AgI system, are described. The ionic conductivity in these glasses increases with the AgI content. Structure consists of a covalent TeO2-Tl2O network and a AgI sublattice with only a weak interaction between them. The AgI-TlI system offers a deep eutectic for the (AgI)0.75(TlI)0.25 composition with a melting point at 220°C. This favourable medium has been selected to prepare new silver FIC glasses. So, glasses belonging to the pseudo quaternary TeO2-Tl2O-AgI-TlI system have been elaborated : the study of transport properties of [TeO2-TlO0.5]1-x [(AgI)0.75 (TlI)0.25]x glasses has shown a very high ionic conductivity for [MATH]. The influence of the Tl+ ions presence on the Ag+ ions mobility is discussed.
© EDP Sciences 1992