Precise Control of Impurity Phases in Sol-Gel Synthesized Nanostructured Barium Titanate by Accurate Adjusting Heat Treatment Condition

Barium titanate (BaTiO3) is a well-known ferroelectric ceramic with high dielectric constant and good electromechanical properties, which makes it the best candidate for replacing the lead zirconium titanate (PZT) in the industry on account of its non-toxicity compared to PZT. Barium titanate samples are synthesized via modified sol-gel method and the sol is acid-water based. Various calcination parameters and their impact on impurity contents of barium titanate nanostructured powders are carried out. Our goal is to discover the lowest possible time and temperature required for complete calcination of the samples with lowest impurity content alongside realizing the most important factor in reducing impurity contents between time, temperature, and heating rate. With the aid of X-Ray diffraction analysis, these impurities are recognized and efforts are made to eliminate them as much as possible. The best results by far is obtained in heating rate of 40 °C/min up to 650 °C and holding in that temperature for 1 hour. The grain size and morphology of calcined barium titanate powder with the best chosen condition is obtained from field emission scanning electron microscopy, designating particle size of about 50 nm

کلیدواژه ها:

Barium titanate ، Sol-Gel ، Heat treatment ، X-ray diffraction