Room-temperature synthesis of BaTiO₃ particles under highly basic conditions

Abstract

We studied synthesis of BaTiO₃ at low temperatures in NaOH solutions containing Ba(OH)₂•8H₂O and titania or titanate particles. Cubic BaTiO₃ crystals were successfully obtained at room temperature (25°C) under a highly basic condition with 2.9 M NaOH in a polypropylene bottle. Fine particles of anatase and titanate were effectively reacted with Ba²⁺ with a large amount of OH^- even at room temperature. The particle size and crystallinity of BaTiO₃ grown in the solutions depended on the Ba/Ti molar ratio and the concentrations of NaOH and Ba²⁺ ion.