Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi2O6and LiBO2- Structure-Dynamics Relations in Two Glass Forming Compounds

Alexander Kuhn, Esther Tobschall, Paul Heitjans
2009 Zeitschrift fur physikalische Chemie (Munchen. 1991)  
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 samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that
more » ... glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27 Al, 12 B magic angle spinning NMR measurements.
doi:10.1524/zpch.2009.6084 fatcat:ulyc6k72qzbctkz65lwnybikzm