Relaxor ferroelectric polymer exhibits ultrahigh electromechanical coupling at low electric field

Xin Chen, Hancheng Qin, Xiaoshi Qian, Wenyi Zhu, Bo Li, Bing Zhang, Wenchang Lu, Ruipeng Li, Shihai Zhang, Lei Zhu, Fabrice Domingues Dos Santos, J. Bernholc, Q. M. Zhang

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

Electromechanical (EM) coupling—the conversion of energy between electric and mechanical forms—in ferroelectrics has been used for a broad range of applications. Ferroelectric polymers have weak EM coupling that severely limits their usefulness for applications. We introduced a small amount of fluorinated alkyne (FA) monomers (<2 mol %) in relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (PVDF-TrFE-CFE) terpolymer that markedly enhances the polarization change with strong EM coupling while suppressing other polarization changes that do not contribute to it. Under a low–dc bias field of 40 megavolts per meter, the relaxor tetrapolymer has an EM coupling factor (k33) of 88% and a piezoelectric coefficient (d33) >1000 picometers per volt. These values make this solution-processed polymer competitive with ceramic oxide piezoelectrics, with the potential for use in distinct applications.

Original languageEnglish (US)
Pages (from-to)1418-1422
Number of pages5
JournalScience
Volume375
Issue number6587
DOIs
StatePublished - Mar 25 2022

All Science Journal Classification (ASJC) codes

  • General

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