Figure 2. Temperature-dependent dielectric constant of ferroelectric-paraelectric phase transition. In the ferroelectric state the field-dependent electric polarization exhibits hysteresis.
Ferroelectric materials possess a wide variety of applications, including ferroelectric memory storage (FERAM), pyroelectric temperature-sensors, and piezoelectric speakers. Currently, perovskite ferroelectrics such as lead titanate (PbTiO3) dominate due to their high figures of merit. Due to the presence of lead, it is desirable to develop new, more enviromentally friendly, materials.