Improvement of the dielectric properties of BaTiO3 powder-polymer composite using molten salt treatment

The dielectric films consisted of the barium titanate (BaTiO₃) powder particle and the polymer were fabricated using the sodium chloride (NaCl)-flux treatment to investigate the effect of the molten salt on the dielectric properties of the BaTiO₃ particles. The BaTiO₃ particles for the NaCl-flux treatment were prepared by calcining the mixture of the BaTiO₃ and the NaCl at the various temperatures. The NaCl-flux treated BaTiO₃ particles showed the smooth surface and high crystallinity compared to the non-treated BaTiO₃ particles, because the BaTiO₃ particles were recrystallized by NaCl-flux treatment. In addition, high dielectric performances of a 20% increase in the dielectric constant, a 40% decrease in the dielectric loss, and a 280% increase in the dielectric strength were achieved. The dielectric films of the NaCl-flux treated BaTiO₃ particles could induce the high dielectric performances due to the improvement of the crystallinity with highly packing density.