A theoretical mechanism for nuclear-spin relaxation in ionically conducting glasses (or disordered crystals) is proposed. This is based on the diffusion-controlled relaxation model previously used to account for electrical relaxation in such materials. In this model, ionic relaxation is assumed to occur at interstitial 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 use of this model.

• Received 4 March 1991

DOI:https://doi.org/10.1103/PhysRevB.44.47