公开(公告)号：IN175115B

公开(公告)日：1995-04-29

申请号：IN168DE1988

申请日：1988-03-07

Applicant: IBM

Inventor： BEYERS ROBERT BRULE ,  ENGLER EDWARD MARTIN ,  GRANT PAUL MICHAEL ,  LIM GRALE SU

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  B22F1/00

Abstract: Compositions having the formula A1+/-xM2+/-xCu3Oy, 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 77K. 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 DEG C and about 1100 DEG C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.