Characteristics of BaTiO{sub 3} particles prepared by spray-coprecipitation method using titanium acylate-based precursors

Journal Article · Tue Dec 01 04:00:00 EST 1998 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm980520h· OSTI ID:328243

Choi, G J; Lee, S K; Woo, K J; Cho, Y S ^[1]; Koo, K K ^[2]

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1. Korea Inst. of Science and Technology, Seoul (Korea, Republic of). Div. of Chemical Engineering
2. Sogang Univ., Seoul (Korea, Republic of). Dept. of Chemical Engineering

BaTiO{sub 3} particles of ultrafine size and high crystallinity were produced by a spray-coprecipitation technique. To improve stability, titanium isopropoxide was acylated using acetic acid. The sol solutions were prepared by mixing the titanium acylate with aqueous barium acetate. Spray-precipitation was performed in concentrated KOH solution (pH > 13). Investigated variables were the metal content and Ba/Ti ratio in sol solutions, the reaction temperature and time, and the calcination temperature. BaTiO{sub 3} particles were synthesized in an aggregate form composed of tiny spherical, crystalline grains (20--30 nm in diameter). The barium-deficient stoichiometry of resulting particles was closely related to a rather poor precipitation yield of barium ions in KOH solution. Crystalline BaTiO{sub 3} phase was formed by two different mechanisms: ion-solid reaction and solid-state reaction. BaTiO{sub 3} particles, in purely cubic phase as synthesized, underwent a phase transition to tetragonal phase by calcination over 500 C.

• OSTI ID: 328243
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 12 Vol. 10; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCINATION
MORPHOLOGY
PARAMETRIC ANALYSIS
PARTICLE SIZE
POWDERS
PRECIPITATION
SPRAYS
SYNTHESIS
TITANIUM OXIDES