NiNb ₂ O ₆ ‐BaTiO ₃ /poly(arylene ether nitriles) composite film dielectrics with excellent flexibility and high permittivity for organic film capacitors

Abstract Nickel niobate (NiNb ₂ O ₆ ) was used to modify the barium titanate (BaTiO ₃ ) ceramics, the obtained NiNb ₂ O ₆ ‐BaTiO ₃ ceramics possess better dielectric performances than that of raw BaTiO ₃ . By adding NiNb ₂ O ₆ ‐BaTiO ₃ into poly(arylene ether nitriles) (PEN) polymer, a series of NiNb ₂ O ₆ ‐BaTiO ₃ /PEN composite films with different NiNb ₂ O ₆ ‐BaTiO ₃ contents were prepared via solution casting method. The morphology, thermal, mechanical, dielectric properties, and flexibility of the obtained NiNb ₂ O ₆ ‐BaTiO ₃ /PEN composite films were investigated detailedly. As the filler content increases, the tensile modulus of NiNb ₂ O ₆ ‐BaTiO ₃ /PEN composite films increases gradually, while the tensile strength decreases. Thermal and flexibility analysis shows that the addition of the NiNb ₂ O ₆ ‐BaTiO ₃ fillers does not affect the thermal and flexibility properties endowed by the PEN matrix. The dielectric constant of the composites almost linearly increases from 3.7 (1 kHz) to 15.3 (1 kHz) as the filler content increases from 0 to 40 wt%. Besides, results show that NiNb ₂ O ₆ ‐BaTiO ₃ /PEN composites exhibit higher dielectric constant than that of BaTiO ₃ /PEN. The as‐prepared NiNb ₂ O ₆ ‐BaTiO ₃ will be a more promising filler to prepare polymer‐ceramic composites for organic film capacitors.