A simple method of producing very fine, homogeneous
BaxSr1-xTiO3 powders was
developed in this study by wet-chemically reacting
Ti(0H)4-xH2O, Ba(OH)2, and
Sr(OH)2 as raw materials under 100°C. Relationships were
obtained between particle size, composition, and reaction temperatures,
reaction tunes, 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 independant
of the reaction time. In light of the varying reactivities of Ba and Sr
towards Ti, reaction time was found to be a primary factor which controls
the precise Ba/Sr ratio and (Ba+Sr)/Ti ratio of the titanate powder. A
suitable reaction condition was observed to have prevented by-products
Ba2Ti04 from being formed.
The titanate powders were compressed and sintered for various temperatures.
The compressibility and the sinterability of the powders were obtained. The
microstrucure, dielectric constant and dissipation factor of the titanate
ceramics ware observed and measured. These values sufficiently correlated
with those of the titanate ceramics produced from the powders by the
solid-state sintering method.