In recently years, novel ferroelectric behaviors, such as narrow single and double hysteresis loops, have been achieved for ferroelectric polymer. Given the semicrystalline nature of most ferroelectric polymers, both internal crystal structure and external confinement effects affect these novel ferroelectric behaviors. In this presentation, we will use examples of poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] based terpolymers and e-beamed P(VDF-TrFE) to explain the internal crystalline structure effect. For the confinement effect, we will introduce crystal (or domain)-amorphous interactions to explain the competition between polarization and depolarization fields. When the depolarization field is greater than the polarization field, the double hysteresis loop behavior will be obtained. In conclusion, these novel ferroelectrics are promising for high energy density and low loss dielectrics.

Converting ferroelectric polymers into high energy density and low loss dielectrics

245th National Meeting (2013)

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