Morphological evolution of nanometer-sized BaTiO{sub 3} particles

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:468901

Chun, C M; Navrotsky, A; Aksay, I A ^[1]

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1. Princeton Univ., NJ (United States)

Highly pure, stoichiometric, nanometer-sized, and fairly monodispersed anhydrous crystalline BaTiO{sub 3} particles are synthesized under hydrothermal conditions in a single process step without further heat treatment by reacting titanium isopropoxide [Ti(OC{sub 3}H{sub 7}){sub 4}] precursor in aqueous solutions of Ba(OH){sub 2} at 80{degrees}C. Traditional considerations of solution hydrolysis, solute condensation, and nucleation only partly explain the generation of the {open_quotes}rasberry-like{close_quotes} BaTiO{sub 3} particles composed of 5{approximately}10 nm primary crystalline particles. Consequently, the colloidal interaction of the precipitating particles and, therefore, controlled aggregation of freshly nucleated particles must be taken into account. Our TEM studies show aggregation growth of small subunits to form uniform, rounded polyhedral particles, suggesting colloidal stability may play a key role in controlling precipitate size and shape.

• OSTI ID: 468901
• Report Number(s): CONF-960877--; CNN: Grant AFOSR-F49620-93-1-0259
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CRYSTAL STRUCTURE
MORPHOLOGY
TIME DEPENDENCE
TITANATES