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Microstructural changes that occurred during the sintering of alumina doped with TiO 2 and SiO 2 have been investigated. The kinetics of normal grain growth at the initial stage is retarded by the dopant segregation at the grain boundaries. However, due to the accumulation of dopants at the grain boundaries during grain growth, its concentration at the boundaries ultimately exceeds...
Nanocrystalline CeO 2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as solvent, cerium nitrate hexahydrate as cerium source and diethylamine (DEA) as precipitant. Precipitation participating anions (OH − ) are generated via the hydrolysis of DEA with the molecular water of the cerium salt. Irrespective of solvent...
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