J. Phys. IV France
Volume 02, Numéro C2, Octobre 1992
European Workshop on Glasses and Gels
Page(s) C2-51 - C2-59
European Workshop on Glasses and Gels

J. Phys. IV France 02 (1992) C2-51-C2-59

DOI: 10.1051/jp4:1992206

Nuclear spin relaxation in glassy ionic conductors


1  Laboratoire de Science des Matériaux Vitreux, Université de Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
2  Department of chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

The nuclear spin relaxation behaviour in disordered ionically conducting materials is ascribed to a mechanism based on diffusion-controlled relaxation. In this target-diffusion model, relaxation is assumed to occur at interstitialcy sites, triggered by the arrival of diffusing ions. The dependence of the spin-lattice relaxation rate on the temperature, Larmor frequency and ionic concentration can all be understood with this model. The results of a nuclear spin-lattice relaxation study of the mixed-alkali effect in glasses can, on this basis, be interpreted in terms of changes in ionic mobility.

© EDP Sciences 1992