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In this work nuclear magnetic resonance (NMR) and impedance spectroscopy (IS) studies on Li ion dynamics in microcrystalline  γ -LiAlO 2  are presented. The sample was prepared by solid state synthesis between Li 2 CO 3  and Al 2 O 3  in air, followed by a quenching procedure. The presence of phase-pure  γ -LiAlO 2  was confirmed by X-ray powder diffraction including Rietveld refinement. Further structural characterization was done with  6 Li,  7 Li and  27 Al NMR. Several NMR techniques such as spin-lattice relaxation measurements, motional narrowing experiments, as well as spin-alignment echo were employed for the investigation of Li ion diffusion. The measurements were carried out at high temperatures (up to 970 K) in order to access the regime of Li ion motion being very slow. The dc conductivities measured by IS in the temperature range from 680 K to 870 K were converted to diffusion coefficients being compatible with those obtained by NMR.

NMR and Impedance Spectroscopy Studies on Lithium Ion Diffusion in Microcrystalline γ -LiAlO 2