| 摘要 |
PURPOSE:To provide a producing method capable of obtaining a ABO3 type compound composed of uniform and spherical particles of <1mum, preferably <0.5mum particle diameter, having 1.000+ or -0.002mol ratio of A group element to B group element, excellent in crystallinity and extremely little in impurities such as alkali metals. CONSTITUTION:This producing method is composed of (a) a 1st process for obtaining a slurry mixture of at least one kind of salts of A group element composed of Mg, Ca, Sr, Ba and Pb and at least one kind of salts of B group element composed of Ti, Zr, Hf and Sn with water or an alkaline aq. solution, (b) a 2nd process for obtaining a hydrothermal synthetic powder by the hydrothermal reaction of the slurry mixture and after repeating cleaning several times, filtering and drying, (c) a 3rd process for allowing a mixture of the hydrothermal synthetic powder obtained in the 2nd process with the alkaline aq. solution to hydrothermally react. For instance, the obtained powdery barium titanate is 0.2-0.3mum in particle diameter, 0.999 in Ba/Ti ratio, 100ppm in Na content and 20ppm in Cl content. |
