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Wiedemann, Dennis; Indris, Sylvio; Meven, Martin; Pedersen, Björn; Boysen, Hans; Uecker, Reinhard; Heitjans, Paul and Lerch, Martin (2016): Single-crystal neutron diffraction on gamma-LiAlO2: structure determination and estimation of lithium diffusion pathway. In: Zeitschrift für Kristallographie-Crystalline Materials, Vol. 231, No. 3: pp. 189-193

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Abstract

gamma-Lithium aluminum oxide is a paradigmatic example of an ultraslow lithium ion conductor. This characteristic plays a crucial role in its proposed and actual applications. Herein, we report on the outcome of single-crystal neutron diffraction studies at ambient and high temperature. Careful evaluation confirms the commonly assumed room-temperature structure as derived by powder neutron diffraction in 1965. At 1043 K, a split of the lithium position hints at the onset of intrinsic diffusion. Analysis of the negative scattering-length density using the maximum-entropy method (MEM) indicates a preference for a strongly curved diffusion pathway traversing octahedral voids between adjacent lithium sites. These results help to understand ultraslow lithium diffusion in well-ordered ionic solids on the microscopic scale and, ultimately, to establish structure-property relationships.

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