Powder and Dielectric Characterization of Hydrothermally Synthesized Barium Titanate Nanopowders
Barium titanate (BaTiO3) particles with average size of smaller than 100 nm were synthesized by a hydrothermal process at 100°C to 300°C. The c- to a-axis ratios of the particles increased as the synthesis temperature increased. Disk capacitors were fabricated with as-synthesized particles and some additives to obtain X7R capacitors. The temperature coefficient of capacitance with particles synthesized at 100°C was much larger than that for 300°C, indicating that the former had uniform composition in the grain while the latter had a core-shell structure. This data show that barium titanate particles hydrothermally synthesized at high temperature are useful when creating the X7R capacitors with small grain size.
Keiichi Katayama, Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
K. Tokita and S. Sato, "Powder and Dielectric Characterization of Hydrothermally Synthesized Barium Titanate Nanopowders ", Key Engineering Materials, Vol. 320, pp. 143-146, 2006