Presented in Figs 1 and 2 are a comparison of the polar-ization and dielectric (real part) responses of the copoly-mer and terpolymer. As a ferroelectric, the copolymer ex-hibits a nearly square polarization hysteresis loop due to the large nucleation barrier for domain wall motion. The remnant polarization (Pr) is 75 mC/m2 and the cohesive electric field (Ec) is around 60 MV/m. This hysteresis is nearly eliminated in the P(VDF-TrFE-CFE) terpolymer, asexpectedforarelaxorferroelectricattemperaturesnear the dielectric constant maximum (due to the absence of macroscopic polarization domains). Pr and Ec for the re-laxor terpolymer are much smaller, i.e., 2.5 mC/m2 and
4 MV/m, respectively. For the dielectric constant, the P(VDF-TrFE) copolymer exhibits a sharp ferroelectric-paraelectric (F-P) transition at 110◦C (see Fig. 2) and the peak position does not depend on frequency. In contrast, the P(VDF-TrFE-CFE) terpolymer shows a much broad peak in the dielectric constant near room temperature and the peak position shifts progressively to higher tempera-turewithfrequency,whichisafeaturetypicalofferroelec-tric relaxors [23]. It should be noted that at some tempera-tures below the dielectric constant maximum, the relaxor polymer exhibits large polarization hysteresis, which is another characteristic of ferroelectric relaxors [5, 24].