Process for making 90 k superconductors

Details Process for making 90 k superconductors Process for making 90 k superconductors

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H01L 39/00 (2006.01) C01F 1/00 (2006.01) C01G 1/02 (2006.01) C01G 3/00 (2006.01) C01G 3/02 (2006.01) C04B 35/45 (2006.01) H01L 39/12 (2006.01) H01L 39/24 (2006.01)

Patent

CA 1337373

There is disclosed an improved process for preparing a superconducting composition having the formula MBa2Cu3Ox wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm Yb and Lu; x is from about 6.5 to about 7.0; said composition having a superconducting transition temperature of about 90 K; said process consisting essentially of (a) forming a suspension having an M:Ba:Cu atomic ratio of about 1:2:3 by mixing Ba(OH)2?8H2O, BaO or BaO2 amd M2O with an aqueous solution of cupric carboxylate or cupric nitrate at a temperature from about 50°C to about 100°C, or mixing Ba(OH)2?8H2O with an aqueous solution of Cu carboxylate, nitrate or a mixture therof and M carboxylate, nitrate or a mixture thereof at a temperature from about 50°C to about 100°C; (b) drying the suspension formed in step (a) to obtain a precursor powder; and (c) heating and cooling the powder under specified conditions to form the desired product.

569064

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