Classical or relaxor ferroelectric ceramics in the BaTiO3-KNbO3-CaTiO3 system

In perovskites, the relaxor behavior occurs dominantly in lead based compositions. The study of the BaTiO3 - KNbO3 binary diagram provided previously evidence for new free from lead ferroelectric relaxor properties but unfortunately at low temperature. The present dielectric studies of ceramics with composition inside the BaTiO3 - KNbO3 - CaTiO3 showed some of them to be ferroelectric relaxor at temperature close to 300K. Such a favourable effect is due to the Ca^2+ - Ba^2+ cationic substitution. These new compositions are of interest for applications (dielectric for capacitors, actuators) in the way of environmental protection.