Preparation of apatite-type La_(9.33)(SiO_4)_6O_2 oxide Ion conductor by alcoxide-hydrolysis

摘要

Both powder and film of apatite-type La_(9.33)(SiO_4)_6O_2 were prepared by alcoxide-hydrolysis. The apatite formation temperature was considerably lowered in this preparation method comparing to its solid-state reaction. Its sintered body did not show any particular orientation of the anisotropic apatite crystals. Electrical conductivity was 7.2 x 10~5 S cm~ -1 at 500 deg C. The films deposited on quartz glass and Pt substrates with thickness of either 1.0 or 1.5 mu m had uniform microstructure extended on their surface. Preferred orientation of La_(9.33)(SiO_4)_6O_2 was observed on the surface of the film deposited on quartz glass substrate; its basal plane was parallel to the substrate.