One-dimensional Li ionic conductor LiAlSiO4 (β-eucryptite) thin film was prepared on SiO2 glass (quartz glass) substrates by pulsed laser deposition method. It was revealed that a crystal structure of the as-prepared thin film was an amorphous structure, and by annealing above 1000C, the thin film exhibited a β-eucryptite structure. The temperature dependence of ionic conductivity of the β-LiAlSiO4 thin films was measured for various film thicknesses. A change of activation energy was observed at around 700K, which was due to the structural phase transition of β-LiAlSiO4. The ionic conductivity of β-LiAlSiO4 thin film increased with a decrease in the film thickness. The conductivity enhancement was considered to have originated from a construction of a high-ionic conduction region at the SiO2-β-LiAlSiO4 boundary.

Preparation and Ionic Conductivity of β-LiAlSiO4 Thin Film. F.Shinichi, S.Satoshi, S.Kaduhiro, T.Hitoshi: Solid State Ionics, 2004, 167[3-4], 325-9