https://w3id.org/matsci-sam/vocabulary/id4/ferroelectric
Canonical definition
A ceramic material with a switchable spontaneous polarization via positively and negatively biased electric fields, due to weird behaviors of charge density in noncentrosymmetric dielectric crystals
Hafnia, PZT, AlScN
A material that exhibits spontaneous electric polarization that can be reversed by an external electric field.
Lead Zirconate Titanate (PZT) is a widely used ferroelectric ceramic in sensors and actuators.