Dimension effects on the dielectric properties of fine BaTiO₃ ceramics

It is found that the core-shell structured grains are easy to produce for fine grain doped BaTiO₃ ceramics in the sintering process. We study the influence of the core-shell structure on the Curie-Weiss temperature and dielectric properties of BaTiO₃ ceramics by using effective medium approximation (EMA). Considering the second approximation, the dielectric properties of fine grain doped BaTiO₃ ceramics are consistent with experimental data.