Regensburg 2004 – scientific programme

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DF: Dielektrische Festkörper

DF 5: Poster

DF 5.12: Poster

Wednesday, March 10, 2004, 14:30–18:00, Poster C

Studies on local structure and Li diffusion in LiAlO₂ single crystals using ⁷Li and ²⁷Al NMR spectroscopy — •Sylvio Indris¹, Daniel Albrecht¹, Paul Heitjans¹, and Reinhard Uecker² — ¹Institut für Physikalische Chemie und Elektrochemie, Universität Hannover, 30167 Hannover, Germany — ²Institut für Kristallzüchtung, 12489 Berlin, Germany

We studied the local structure of LiAlO₂ single crystals by ⁷Li and ²⁷Al NMR spectroscopy. Lineshape measurements with different orientations of the crystals with respect to the magnetic field give the possibility to probe the electric field gradients at the sites of the Li and Al ions, respectively, and thus yield information about the local symmetry of these sites. The dynamics of the Li ions was studied via the temperature dependence of the ⁷Li NMR lineshapes and ⁷Li spin-lattice relaxation times T₁. These measurements were done at temperatures between 300 K and 1000 K and for different crystallographic orientations. The results are discussed with respect to the hopping rate of the Li ions and the activation barriers for single ion jumps and are compared with results from conductivity measurements and quantum chemical calculations.