Dielectric properties of (Ba1-xCex)TiO3

Ce substitution fur the Ba site shifted the Curie point to a lower temperature than typical substitution with elements such as Zr and Sr. The substitution of Cc for the Ba sites up to 2.0 mol% exhibited a typical donor-doped behavior, the material being fine grained and of depressed dielectric constant at the Curie point. The specimens doped with more than 2.0 mol% CeO2 had relatively high dielectric constant at the Curie point. The increase in dielectric constant at the Curie point seems to be correlated with the grain size. Dielectric properties and microstructure development of highly Ce-doped BaTiO3 are discussed in terms of defects in the cation sublattice.