Preparation of compound bismuth oxide

Abstract

Abstract PURPOSE:To obtain fine particles of compound bismuth oxide having uniform compsn. and high purity by allowing >= two kinds of alkoxide cong. Bi alkoxide to react with each other and hydrolyzing the reaction product and calcining the hydrolyzed product thereafter. CONSTITUTION:Bi alkoxide is mixed with at least one kind of alkoxide of Ba, Sr, Ca, Pb and/or Mo, W, Nb, Ta, Ti, etc. in an org. solvent (e.g. benzene) at 0-100 deg.C to cause reaction. Decarboxylated distilled water is added to the soln. of the reaction product at 0-100 deg.C, or steam is blown out of a pressurized vessel at 100-200 deg.C to contact with the reaction product and to hydrolyze the reaction product, to obtn. powdery white precipitate. Then, the precipitate is filtered and dried, and calcined then at >=600 deg.C and < an initiating temp. of decomposition of the compound oxide. Thus, a compound Bi oxide having high purity contg. <=0.1wt% impurity and 0.01-0.1 micron particle size being expressed by the formula (where A is Ba, Sr, Ca, Pb; B is Mo, W, when n=1; Nb, Ta, when n=2; Nb, Ti, etc. when n=3).

Inventors

• 👤 Yoshiharu Ozaki
• 👤 尾崎　義治
• 👤 Mitsushi Wadasako
• 👤 三志 和田迫
• 👤 Masa Kubota
• 👤 雅 久保田

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