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In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi 2 O 6 ) and lithium metaborate (LiBO 2 ), was examined using  7 Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured sampleswere prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the correspondingglass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, whenthe crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivityof these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samplesare treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassysamples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processesas is suggested by supplementary infrared spectroscopy and  27 Al,  12 B magic angle spinning NMR measurements.

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi 2 O 6 and LiBO 2 - Structure-Dynamics Relations in Two Glass Forming Compounds