PEROBUSUKAITOGATASANKABUTSUBIFUNMATSUNOSEIZOHO

摘要

PURPOSE:To easily produce the titled uniform pulverous powder having good crystallinity by brining an aq. soln. contg. ions of prescribed components into reaction with an excess oxalic acid in the presence of ethanol and decomposing thermally the precipitate obtd. with ammonia, etc., at high pH. CONSTITUTION:The aq. soln. contg. the constituting metallic element ions of the perovskite type oxide expressed by the general formula; PbZr1-xTixO3 (where 0<=x<=1.0) is brought into reaction with the excess oxalic acid of 10-25mol% of the total molar number of the above-mentioned ions in the presence of ethanol to form the precipitate. A basic gas or basic aq. soln. such as gaseous ammonia or aq. ammonia of which the oxalate such as ammonium oxalate formed by reacting with an oxalic acid is insoluble in an aq. ethanol soln. and is decomposed to evaporate by heating is thereafter brought into reaction with the aq. ethanol soln. contg. the above-mentioned borate. The resultant precipitate is theremally decomposed at about 600-800 deg.C after filtration and sepn., by which the pulverous perovskite type oxide powder having easy dispersibility is obtd.