SUPERCONDUCTING PEROVSKITES
    13.
    发明专利

    公开(公告)号:AU1278388A

    公开(公告)日:1988-09-15

    申请号:AU1278388

    申请日:1988-03-08

    Applicant: IBM

    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.

    TETRATHIAPENTALENE AND TETRASELENAPENTALENE COMPOUNDS

    公开(公告)号:CA1064043A

    公开(公告)日:1979-10-09

    申请号:CA292334

    申请日:1977-12-05

    Applicant: IBM

    Abstract: TETRATHIAPENTALENE AND TETRASELENAPENTTALENE COMPOUNDS This application is concerned with tetrathiapentalene and tetrasalenapentalene compounds. Specifically, it is concerned with 1, 3, 4, 6-tetrathia-2, 5-dihetexo-pentalene and 1, 3, 4, 6 tetraselena-2, 5-dihetero-pentalene compounds having the formula or wherein X is S or Se; each of Y1 and Y2 is O, S, or Se; each or Z1 and Z2 is -SR, SeR ox = N? wherein R and Rr are H, alkyl, aryl, or together form a ring of carbon atoms; and An is the anion of a strong acid. These compounds are key synthetic intermediates for the preparation of tetrathiafulvalene and tetraselenafulvalene materials, in the art of producing organic conductors.

    20.
    发明专利
    未知

    公开(公告)号:FR2316628A1

    公开(公告)日:1977-01-28

    申请号:FR7615015

    申请日:1976-05-13

    Applicant: IBM

    Abstract: A method of optically printing conductive characters using charge transfer compounds is provided. The method is characterized by depositing an organic pi electron donor compound dissolved in a halogenated hydrocarbon (halocarbon) on a suitable substrate and selectively exposing the so coated substrate to actinic radiation to obtain a permanent, highly conductive, image.

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