PROCESS FOR THE PREPARATION OF A SOL-GEL SOLUTION USED FOR THE PREPARATION OF A BARIUM TITANATE DOPED BY HAFNIUM AND / OR AT LEAST ONE LANTHANIDE ELEMENT

摘要

The invention relates to a process for preparing a sol-gel solution for use in the preparation of a hafnium-doped barium titanate ceramic and / or at least one lanthanide element comprising the following steps: a) a a contacting step of a first mixture comprising a barium carboxylate and a diol solvent and a second mixture comprising a titanium alkoxide and a hafnium alkoxide and / or an alkoxide of a lanthanide element in a monoalcoholic solvent; b) a step of distilling the mixture resulting from step a), in order to remove at least a portion of the monoalcoholic solvent; c) a step of adding, hot, acetic acid to the distilled mixture of step b).