Enhanced dielectric permittivity and relaxor behavior in thermally annealed P(VDF-TrFE) copolymer films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number232903
Journal / PublicationApplied Physics Letters
Volume117
Issue number23
Online published10 Dec 2020
Publication statusPublished - Dec 2020

Abstract

Modification of relaxor behavior and large enhancement in dielectric permittivity are demonstrated in a P(VDF-TrFE) ferroelectric polymer film by thermal annealing treatment. For coexisting normal ferroelectric and relaxor behavior in P(VDF-TrFE) (molar ratio: 45:55) films, the relative contribution from the relaxor component is increased when annealed at high temperature and subsequently quenched. A relative peak permittivity of ε′ ∼ 100 is obtained for an annealing temperature of T = 90 ºC, which is one of the highest reported so far among poly(vinylidene fluoride) copolymer and terpolymer films. Based on x-ray diffraction analysis, we attribute the changes in dielectric properties to a decrease in crystallite domain size and a consequent increase in the crystalline-amorphous interfacial area.

Research Area(s)

  • FERROELECTRIC BEHAVIOR, POLY(VINYLIDENE FLUORIDE), ENERGY DENSITY, PHASE, TRIFLUOROETHYLENE, POLARIZATION, POLYMERS, TRANSITION