1. Ionic polarization causes the ferroelectric effect as well as dipolar polarization. 2. In particular, ice XV is ferroelectric as had been predicted. 3. Ferroelectric crystals often show several transition temperatures and ferromagnetic crystals.4. Ferroelectric liquid crystals are used in production of reflective LCoS.5. Ferroelectric , dielectric ( paraelectric ) and piezoelectric materials have electric polarisation.6. All ferroelectric materials are pyroelectric and piezoelectric, but not the converse. 7. A ) Ferroelectric soft-mode frequency as a function of temperature. 8. Ferroelectric materials are required by symmetry considerations to be also piezoelectric and pyroelectric.9. Among pyroelectric materials, some of them are ferroelectric . 10. Materials are only ferroelectric below their corresponding transition temperature.
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