Sol-Gel synthesis and NMR characterization of ceramics

摘要

Sol-gel chemistry allows the low temperature synthesis of ceramic powders. The molecular engineering of alkoxide precursors leads to the crystal- lization of ceramic powders of controlled morphology and structure. Stable sols of tetragonal zirconia have been synthesized via the hydrolysis of chemically modified zircnium alkoxides. Complexing acetylacetone ligands slow down condensation processes and prevent the aggregation of nanosized zirconia particles. The hydrolysis rates of the different molecular precursors have to be matched when multicomponent ceramics such as cordierite are prepared via the sol-gel route.