公开(公告)号：DE3888217D1

公开(公告)日：1994-04-14

申请号：DE3888217

申请日：1988-01-29

Applicant: IBM

Inventor： BEYERS ROBERT BRUCE ,  ENGLER EDWARD MARTIN ,  GRANT PAUL MICHAEL ,  LIM GRACE SU ,  PARKIN STUART STEPHEN PAPWORTH

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

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.

公开(公告)号：DE3780347D1

公开(公告)日：1992-08-20

申请号：DE3780347

申请日：1987-04-22

Applicant: IBM

Inventor： AHLERT RICHARD HENRY ,  HOWARD JAMES KENT ,  LIM GRACE SU

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/706 ,  G11B5/73 ,  G11B5/738 ,  G11B5/70