Hydrothermal Preparation of BaTiO₃ Powders from Modified Hydroxide Precursors

Fine BaTiO ₃ powders have been prepared by using barium hydroxide (Ba(OH) ₂ ) and titanium peroxo-hydroxide (TiO ₂ (OH) ₂ ) as precursors through hydrothermal synthesis. Ba(OH)₂ was used as a barium precursor as well as a pH adjustment agent instead of strong alkaline mineralizers, KOH or NaOH. The present study shows that the hydrothermal reaction by the reactive titanium peroxo-precursor and Ba(OH) ₂ provides a simple low temperature route for producing fine BaTiO ₃ powders. The phase-pure BaTiO ₃ powders with a cubic perovskite structure were almost instantaneously synthesized at a temperature as low as 80°C. The synthesized powders consist of fine and spherical particulates and offer low ceramic processing temperatures and high-density ceramic products.

Keywords:

• Hydrothermal
• BaTiO₃
• powders
• hydroxide precursors

Acknowledgments

This research was performed under the program of Basic Atomic Energy Research Institute (BAERI) which is a part of the Nuclear R&D Programs funded by the Ministry of Science & Technology (MOST) of Korea.

Paper originally presented at IMF-11, Iguassu Falls, Brazil, September 5–9, 2005