Ferroelectricity is the phenomenon in which a spontaneous electric polarization occurs in some materials by the application of an external electric field. Ferroelectricity was observed in Rochelle salt by Valasek in 1920 and the term was introduced in analogy to Ferromagnetism which is the magnetic property of some materials. A very good ferroelectric material is Lead Zirconate Titanate crystals used in piezoelements. The combined properties like piezoelectricity, Pyroelectricity and memory make the ferroelectric materials ideal for making sensors.
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