MICROSTRUCTURAL EVOLUTION IN BaTiO_3 BASED CERAMICS

摘要

Barium titanate based ceramics is widely used for a range of electronic device applications. The properties of BaTiO_3 based ceramics are fundamentally correlated with grain boundary effects and consequently with the microstructure developed during sintering process. Hence, the synthesis of ultrafine powder with good chemical homogeneity is of primarily importance for production of fine grained ceramics with uniform distribution of additives and dopants. A number of wet chemical techniques for producing BaTiO_3 powders, that also enable a homogeneous introduction of dopants at the solution stage, are based on the use of alkoxides, acetates, citrates and oxalates of barium and titanium. Solution techniques offer a more homogeneous BaTiO_3 powders with fine particle size than conventional processing of BaCO_3 and TiO_2 which tends to produce a coarse and multiphase BaTiO_3 powder.