Titanate ceramics from wet-chemically prepared powders

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:51566

Lin, C H; Yan, T S ^[1]

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1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science

A simple method of producing very fine homogeneous Ba{sub x}Sr{sub 1{minus}x}TiO{sub 3} powders was developed in this study by wet-chemically reacting Ti(OH){sub 4}{center_dot}xH{sub 2}O, Ba(OH){sub 2}, Sr(OH){sub 2} as raw materials under 100 C, Relationships were obtained between particle size, composition, and reaction temperatures, reaction times, Sr/Ba ratios, and (Ba+Sr)/Ti ratios of the solution. Experimental results indicated that the particle size, which was around 40 nm, was both proportional to the reaction temperature as well as independent of the reaction time. In light of the varying reactivities of Ba and Sr towards Ti, ion time was found to be a primary factor which controls the precise Ba/Sr ratio (Ba+Sr)/Ti ratio of the titanate powder. A suitable reaction condition was obscured to have prevented by-products Ba{sub 6}Ti{sub 17}O{sub 40} or Ba{sub 2}TiO{sub 4} from being formed. The titanate were compressed sintered for various temperatures. The compressibility and the sinterability of the powders obtained. The microstructure, dielectric constant and dissipation factor of the titanate ceramics observed and measured. These values sufficiently correlated with those of the titanate ceramics produced from the powders by the solid-state sintering method.

• OSTI ID: 51566
• Report Number(s): CONF-940411--; ISBN 1-55899-246-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AQUEOUS SOLUTIONS
BARIUM COMPOUNDS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
DIELECTRIC PROPERTIES
EXPERIMENTAL DATA
HYDROXIDES
MICROSTRUCTURE
PARTICLE SIZE
SCANNING ELECTRON MICROSCOPY
SINTERING
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 1000-4000 K
TITANATES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION