Effect of particle size on the dielectric properties of 0.5Ba(Zr_0.2Ti_0.8)O₃–0.5(Ba_0.7Ca_0.8)TiO₃/polyvinylidene fluoride hybrid films

0.5Ba(Zr_0.2Ti_0.8)O₃–0.5(Ba_0.7Ca_0.8)TiO₃ (BZT–BCT) micro-ceramics were prepared by the solid phase method and sintered at 1400 °C for different times. BZT–BCT/polyvinylidene fluoride (PVDF) hybrid films with 40 vol% filler were also prepared via in melt blending polymerization. For all BZT–BCT micro-ceramics, the dielectric permittivity increased with increasing sintering time. While for BZT–BCT/PVDF hybrid films, the dielectric permittivity decreased with increasing particle size. The dielectric permittivity of the hybrid film sintered for 0.5 h was 37.2 at 10 Hz, which was larger than that of hybrid films with fillers sintered for 1, 2, and 4 h. These results indicated that the permittivity of hybrid films was affected by the different particle sizes of BZT–BCT ceramics and that the interfacial polarization effect is an important feature of BZT–BCT/PVDF composite films.