Well dispersive barium titanate (BaTiO3) nanoparticles were synthesized by molten salt method using barium
hydroxide octahydrate (Ba(OH)2·8H2O), titanium dioxide (TiO2), and the eutectic salts (NaCl–KCl) as
raw materials. The as-prepared samples were characterized by X-ray diffraction, Fourier transform infrared
spectrometry, UV–vis diffuse reflectance spectra, and field emission scanning electron microscopy. The present
results show that BaTiO3 can be formed at low temperature of 600 °C. The crystallinity of BaTiO3
increases with the temperature rising. SEM images clearly indicate that well dispersive BaTiO3 nanoparticles
can also be successfully obtained even at high temperature of 800 °C. Most BaTiO3 nanoparticles display
hexagonal outline in shape. The average size of BaTiO3 nanoparticles is around 50 nm. Meanwhile, compared
with crystalline TiO2, amorphous TiO2 is favorable for the formation of BaTiO3, especially decreasing other
undesired phases. In the end, the formation mechanism of well dispersive BaTiO3 nanoparticles is proposed
for this molten salt system. Well dispersive BaTiO3 nanoparticles begin to show some sintering ability at low
temperature of 900 °C.