Titanate Ceramics from Wet-Chemically Prepared Powders

Abstract

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 Ba6Ti17O40 or 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.

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Correspondence to C. H. Lin.

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Lin, C.H., Yan, T.S. Titanate Ceramics from Wet-Chemically Prepared Powders. MRS Online Proceedings Library 346, 231–236 (1994). https://doi.org/10.1557/PROC-346-231

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