Synthesis of Barium Titanate as an Electroceramic Raw Materials

Abstract

Nowadays, most electronic and electrical parts of equipment in Thailand such as substrates, magnetics, capacitors, ferroelectric, piezoelectric, RAMs, DRAMs, FERAMs, loudspeakers and devices in ultrasonic cleaning are imported. Barium titanate powder is one of electroceramic raw materials. It is used to produce parts of electroceramic products. In this project, barium titanate was produced by hydrothermal synthesis and thermal treatment process. The mol ratios of titanium dioxide to barium hydroxide in the thermal treatment process were 0.5:1, 1:1, and 1:0.5 at 700, 1000 and 1200^oC ,for 3 and 5 hours. Results of all experiments were analysed by x-ray diffraction (XRD), scanning electron microscope (SEM), particle size distribution and liquid pycnometer technique. A good condition for barium titanate synthesis is from the hydrothermal reaction at the weight ratio of 5:20, 90^oC , and 72 hours. The obtained powders possessed high purity, perovskite structure and a density of 6.2520 g/cm³. In addition, an average particle size at the accumulated particle size of 50 percent (d50) is less than 1 micron. For the thermal treatment process, the appropriate condition is 0.5 mol titanium dioxide to 1 mol barium hydroxide at 700^oC for 3 hours. An average particle size at d50 is larger than 5 microns and the density is 4.7100 g/cm³ because its structure is composed of another composition.