Characterization of Barium Titanate powders Prepared by polymeric Precursors Method

Abstract

Barium titanate is the first ferro-electric ceramics and good candidate for variety applications due to its excellent dielectric, ferroelectric and piezoelectric properties. Barium titanate is a member of large family of compound with general formula ABO3 which is called perovskite. Barium titanate is the first discovered ferroelectric perovskite. Doping of BaTiO3 is very important for obtaining very interesting characteristic for various application. Barium titanate is normally an insulator but after doping with trivalent donor such as La it becomes semi-conductive. Synthesis method depends of the desired characteristic for the end application and it was distinguish a significant influence of used method on structure and properties of barium titanate materials. From the experimental results it can be concluded that powders of barium titanate obtained by Pechini process are nanosized. SEM observation indicates that higher percentage of La inhibits grain growth in doped barium titanate. Particle size distribution measurement pointed that the powders are highly agglomerated. Figure 2. shows particle size distribution for pure barium titanate powder. The next step in our work will be addressed to reducing the particle size by attrition milling with zironia media and these results will be presented and discussed.