Ionic conductivity and NMR relaxation study on Li3N single crystal

Both ionic conductivity and ⁷Li NMR relaxation time T₂ were studied on Li₃N single crystal samples containing an oxygen impurity. Owing to the O impurity, the samples showed a high ionic conductivity (σ⊥ = 0.83 S m^?1 and σ_∥= 0.013 S m^?1 at 300 K) and a low activation energy (E_a,⊥ = 0.19 eV and E_a,∥ = 0.24 eV). The intrinsic conduction accompanying vacancy generation within the Li₂N layer was observed in the high temperature region. In the extrinsic region only a motion of the Li ion located in the Li₂N layer is responsible for both σ_⊥ and σ_∥. The site exchange motion of two kinds of Li ion has little importance to the ionic conduction.