Study on Technology of High Purity Barium Titanate by Sonochemical Method

Sichuan University of Science & Engineering, Yang Yong…

    Barium titanate is a typical electronic ceramics with perovskite structure. It, also known as “the backbone of electronic ceramics”, is widely used for thermosensitive resistor, multilayer ceramic capacitor and other electron components for its excellent strong dielectric and ferroelectric properties. At present, the main methods to prepare barium titanate are coprecipitation method, direct precipitation method, hydrothermal synthesis method, sol-gel method and so on. As a new method of preparing ultra-fine material in recent years, sonochemical method has attracted broad scholars’ attention for its wide application prospect and achieving industrialized mass production. Preparing barium titanate by sonochemical method can control the sound intensity and temperature of ultrasonic wave to prepare ultrafine powder. 
    High purity barium titanate (BaTiO3) powder was prepared by sonochemical method with barium chloride and butyl titanate as the raw materials. The samples were characterized by x-ray diffraction, scanning probe, laser particle analyzer and other detection methods. The sonochemical method and its effecting factors for preparation of high purity barium titannate were studied. The influences of sonochemical method and the conventional precipitation method on the particle size of the powder were compared. The results showed that when control the reaction PH at about 3 and control the amount-of-substance ratio of Ba to Ti at 1:(1~1.02), nano-particles prepared through this method belonged to cubic crystal structure, and it was in uniform sphere shape with diameter of 100nm and purity of 99.82%. 
    The detailed experimentation is omitted. 
    Preparing high-purity BaTiO3 by sonochemical method is a new way to prepare micrometric, which has wide development space and application value. The high-purity BaTiO3 prepared by sonochemical method has small particle diameter, uniformity and high purity. Besides, the preparation is easy, so it do benefit to volume-produce in industry. Regulate solution PH at about 3 with the action of ultrasonic wave to prepare comparatively pure precursor. After roasting, we can gain spherical BaTiO3 with particle size of 100nm and cubic phase structure, which can meet the industry standard.