Relaxation processes and conduction behaviour in PVDF-TrFE and KNN-based composites

Polymer-ceramic composites have gained considerable attention in flexible electronic devices due to their uncommon features such as high dielectric constant, low conductivity, and good mechanical flexibility. The electrical responses of various components (ceramic grain & boundary, polymer chains, interface) need be elucidated rationally design high-performance polymer-ceramic composites. This paper provides a detailed analysis dynamic frequency-dependent behaviour with temperature discern the mechanisms responsible for relaxations polyvinylidene fluoride-trifluoro ethylene/K0·5Na0·5NbO3–CaZn1/3Ta2/3O3 (PVDF-TrFE/KNN-1CZT) composite fabricated using solution casting technique. FTIR spectra x-ray diffraction patterns indicate existence polar β-phase, confirming ferroelectric nature films. ferroelectric-paraelectric phase transition (TC ∼ 130 °C) film obtained from DSC DMA data was corroborated by study. introduction ceramic fillers induces an additional relaxation 10 kHz 1 MHz frequency range, owing ceramic-polymer interface formation, which is increment constant storage capacity effective modelled Maxwell-Garnet Yamada models. enhanced films (εr 28) addition filler qualifies these materials capacitive devices. Further, this study enables better understanding processes fillers.