PRODUCTION OF PEROVSKITE-TYPE COMPOUND CONTAINING TUNGSTEN

摘要

PURPOSE:To obtain fine powder of an easily sinterable tungsten-containing lead-type perovskite compound expressed by formula PbAxW1-xO3, by preliminarily precipitating a part of lead or component A and whole tungsten in the form of tungstate and precipitating the remaining components. CONSTITUTION:A tungsten-containing lead-type perovskite-type compound expressed by formula PbAxW1-xO3 (x is 1/2 or 2/3; A is Fe, Ni, etc.) is produced by the following method. An aqueous solution of a tungstate of an amount necessary for forming the objective composition is mixed with an aqueous solution of lead or the component A of an amount equivalent to the tungsten in the tungstate. A tungstic acid salt of lead or the component A is precipitated by this process. The precipitate is suspended in water or an alcohol and the obtained slurry is mixed with an aqueous solution or alcoholic solution of lead and/or component A of amounts necessary for attaining objective composition. A homogeneous precipitate of the whole components can be produced from the above liquid mixture. The precipitate is filtered, dried and calcined at 400-1,000 deg.C.