J. Phys. IV France 02 (1992) C2-51-C2-59
Nuclear spin relaxation in glassy ionic conductorsS. R. ELLIOTT1, 2
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