Electrically superconducting compositions and processes for...

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H - Electricity

01

B

31/106, 31/122,

H01B 12/00 (2006.01) C01F 17/00 (2006.01) C01G 3/00 (2006.01)

Patent

CA 1341623

Compositions having the formula A1 x m 2 x Cu3Oy, wherein A is Y, or a combination of Y, La, Lu, Sc or Yb; M is Ba, or a combination of Ba, Sr or Ca and y is sufficient to satisfy the valence demands, have been found to be bulk electrical superconductors at a temperature above 77°K. The compositions are single phase perovskite-like crystalline structures. They are made by a process involving intimately mixing the metal oxides or their precursors in the proper molar ratios, heating the mixture in the presence of oxygen to a temperature between about 800°C and about 1100°C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.

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