Abstract
The plate-like Na0.5Bi4.5Ti4O15 (P-NBT4) particles were synthesized by molten salt method and dispersed in a poly (vinylindene fluoride) (PVDF) matrix. The alignment of P-NBT4 particles in PVDF matrix perpendicular to the direction of applied electric field could bring to impressive dielectric performance and breakdown strength to the composites. On the one hand, the excellent dielectric property of the P-NBT4/PVDF composites is ascribed to the high capacitance that is consist of P-NBT4 particles micro-capacitances. On the other hand, a higher breakdown strength of the P-NBT4/PVDF composites is owing to that strong barrier layer was formed in the composites by P-NBT4 particles alignment, which bring difficulty to form a conductive pathway. Moreover, the textured P-NBT4/PVDF composites exhibit a high energy density (9.45 J/cm3) and energy efficiency (η) of 52.28% under the critical electric field of 300 kV/mm.
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