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

The dielectric films consisted of the barium titanate (BaTiO
₃
) 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 BaTiO
₃
particles. The BaTiO
₃
particles for the NaCl-flux treatment were prepared by calcining the mixture of the BaTiO
₃
and the NaCl at the various temperatures. The NaCl-flux treated BaTiO
₃
particles showed the smooth surface and high crystallinity compared to the non-treated BaTiO
₃
particles, because the BaTiO
₃
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 BaTiO
₃
particles could induce the high dielectric performances due to the improvement of the crystallinity with highly packing density.