Conductivity and NMR study of ionic mobility in lithium oxide

Abstract

The self-diffusion of Li⁺ ions in the ionic conductor Li₂O has been investigaed by ⁷Li NMR relaxation time and A.C. conductivity measurements. The NMR relaxation data have been fitted using an encounter model in order to obtain the mean jump time (τ) and thence the diffusion coefficient of ⁷Li ions [eqn (1)]. We have established that the mobile ions are Li⁺ and that the mechanism for their diffusion is most probably via cation vacancies.