Study on dielectric behavior of the ferroelectric poly(vinylidene fluoride)/Li and Ti codoped NiO composites

Polyvinylidene fluoride (PVDF) matrix composites filled by Li and Ti codoped NiO (LTNO) with different Li/Ti chemical stoichiometric ratio in the LTNO fillers were prepared using a physical mixing technology and subsequent hot-molding process. The dielectric permittivity of two kinds of PVDF/LTNO composites was studied over a wide temperature and frequency range. The composite with Li0.1(Ti0.02Ni0.98)0.9O (LTNO-A) filler displays a high value in the real part of dielectric permittivity ε′ > 200 at 103 Hz. Whereas as a comparison, the composite filled with Li0.1(Ti0.05Ni0.95)0.9O (LTNO-B) shows a remarkable difference in dielectric permittivity. The result could be attributed to a different physical characteristic of the LTNO fillers, which is from the change of composition and microstructure of LTNO fillers.