Process for preparing compound metal oxides of yttrium, barium and copper
AssigneeMitsubishi Kinzoku Kabsuhiki Kaisha
InventorsEtsuji Kimura, Nozomu Hasegawa, Yutaka Nishiyama
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Abstract
A process for preparing compound metal oxides, superconductive compound oxides, is disclosed. The process comprises preparing an aqueous solution containing a predetermined content ratio of chloride, nitrate or acetate of a rare earth metal, an alkaline earth metal and copper, said content ration corresponding to the composition of the object compound metal oxide, adjusting the pH of the solution to 1.5-2.0, adding oxalic acid in an amount such that the concentration of the residual oxalic acid becomes 0.05 M/l-0.1 M/l, collecting the thus formed precipitate and firing it.
Claims8
A process for preparing a compound oxide of yttrium, barium and copper, comprising preparing an aqueous solution containing said yttrium, barium and copper in a content ratio corresponding to the composition of said compound oxide, adding oxalic acid to said aqueous solution to obtain a precipitate, and adjusting the pH of said aqueous solution to a value of 1.5 to 2.0, wherein said oxalic acid is added in an amount such that 0.05M/l to 0.1M/l of oxalate ions remain after precipitation of said yttrium, barium, and copper, and wherein the ratio yttrium:barium:copper in said solution is about 1:2:3, and collecting and firing said precipitate to obtain a compound oxide in which the ratio of yttrium, barium and copper, respectively, is about 1:2:3.
Dependencies are inferred from the claim text.