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    SUPERCONDUCTING WIRE HAVING HIGH CRITICAL CURRENT DENSITY
    3.
    发明专利
    SUPERCONDUCTING WIRE HAVING HIGH CRITICAL CURRENT DENSITY 失效

    公开(公告)号：JPH11111080A

    公开(公告)日：1999-04-23

    申请号：JP28315597

    申请日：1997-10-01

    Applicant: INT SUPERCONDUCTIVITY TECH ,  NGK INSULATORS LTD ,  CHUBU ELECTRIC POWER ,  HITACHI LTD

    Inventor： ARAI YUSUKE ,  YAMADA YASUSHI ,  KAWASHIMA JUNICHI ,  BUN TAKEKUNI ,  HIRABAYASHI IZUMI ,  KOSHIZUKA NAOKI ,  HIGASHIYAMA KAZUHISA ,  FUJIWARA TETSUO

    IPC: C01G1/00 ,  C01G3/00 ,  H01B12/06 ,  H01L39/02

    Abstract: PROBLEM TO BE SOLVED: To improve critical current density in a magnetic field by the introduction of low inclination grain boundaries into a superconducting oxide film by forming a biaxially oriented superconducting oxide film on a metallic silver substrate having a 100} texture. SOLUTION: An oxide intermediate layer biaxially oriented in a substrate plane, a parallel plane of a substrate is proper in 100}, and magnesium oxide MgO is used as a material. When a lattice miss fit of oxide and superconducting oxide of this intermediate layer is high like 6 to 11%. The superconducting oxide growing on the oxide of the intermediate layer performs pseudo epitaxial growth having fluctuation in in-plane orientation. Due to this fluctuation, low inclination grain boundaries less than one degree of an inclination of a degree of not interrupting a path of a superconducting current, are generated in large numbers in a C axis oriented superconducting oxide film manufactured on the oxide of the intermediate layer. Since these low inclination grain boundaries operate as pin fastening points to trap a magnetic field, high critical current density in the magnetic field can be realized.

    123 SUPERCONDUCTOR OF CALCIUM-SUBSTITUTED RARE-EARTH SERIES
    4.
    发明专利
    123 SUPERCONDUCTOR OF CALCIUM-SUBSTITUTED RARE-EARTH SERIES 审中-公开

    公开(公告)号：JP2003095652A

    公开(公告)日：2003-04-03

    申请号：JP2001286626

    申请日：2001-09-20

    Applicant: INT SUPERCONDUCTIVITY TECH

    Inventor： MACHI TAKAHITO ,  KATO ISAO ,  KOSHIZUKA NAOKI

    IPC: C01G3/00 ,  C01G1/00 ,  C30B29/22 ,  H01B13/00

    Abstract: PROBLEM TO BE SOLVED: To provide a 123 superconductor of rare-earth series which is simple to manufacture and ensures a high irreversible magnetic field. SOLUTION: In the 123 superconductor of rare-earth series which gives the substance represented by the chemical formula of REBa2 Cu3 O7-d (wherein RE is a rare-earth element) as the main element, substituting a portion of RE with Ca ensures the performance that the irreversible magnetic field at the temperature of 77 K is not less than 10 T when applying the magnetic field in the direction of axis C. La, Nd, Sm, Gd or Eu is preferred as RE and in the chemical composition it is preferred that the values of (x) and (y) in RE1-x+y Cax Ba2-y Cu3 O7-d meet the requirements of 0

    MgB2 SUPERCONDUCTOR AND METHOD FOR PRODUCING THE SAME
    6.
    发明专利
    MgB2 SUPERCONDUCTOR AND METHOD FOR PRODUCING THE SAME 审中-公开

    公开(公告)号：JP2003089516A

    公开(公告)日：2003-03-28

    申请号：JP2001280244

    申请日：2001-09-14

    Applicant: INT SUPERCONDUCTIVITY TECH ,  JAPAN SCIENCE & TECH CORP

    Inventor： MACHI TAKAHITO ,  KATO ISAO ,  ITO YUTAKA ,  KOSHIZUKA NAOKI ,  MURAKAMI MASAHITO

    IPC: C01G1/00 ,  C01B35/04 ,  H01B13/00

    Abstract: PROBLEM TO BE SOLVED: To provide an MgB2 superconductor easy to produce and mass- producible as long articles, and to provide a method for producing the superconductor. SOLUTION: The MgB2 superconductor consists of a shell made of a tubular metal such as copper and a core material of the reaction product of Mg and B formed by sealing Mg and B in the shell and heating these. In the method for producing the superconductor, Mg and B are sealed in the tubular metal, the tubular metal in which Mg and B have been sealed is optionally worked in a wire or belt shape and Mg and B are reacted by heating the tubular metal as shown in figure 1. The tubular metal as the shell may be removed from the material after the reaction to obtain an MgB2 superconductor.

    SUPERCONDUCTING POWER CIRCUIT
    7.
    发明专利
    SUPERCONDUCTING POWER CIRCUIT 失效

    公开(公告)号：JP2002136144A

    公开(公告)日：2002-05-10

    申请号：JP2000327423

    申请日：2000-10-26

    Applicant: INT SUPERCONDUCTIVITY TECH

    Inventor： TANAKA SHOJI ,  KOSHIZUKA NAOKI ,  TANABE KEIICHI ,  ENOMOTO YOICHI

    IPC: H01L39/22 ,  H01L27/18 ,  H01L39/24 ,  H02M7/12 ,  H02M7/5387 ,  H03K17/92

    Abstract: PROBLEM TO BE SOLVED: To provide a power circuit which includes a superconducting power circuit, capable of obtaining direct current of low voltage and high magnitude with high conversion efficiency. SOLUTION: This superconducting power circuit A comprises a bridge circuit 5 formed by building superconducting switching devices 1-4, having a Josephson junction capable of flexibly performing switching operations between a superconducting status and a registive status by means of an external magnetic field in respective sides of a diamond bridge, a control unit 6 which switches a pair of superconducting switching devices 1, 3, arranged diagonally in the bridge circuit 5 by means of the external magnetic field, into the superconducting status and the other pair of superconducting switching devices 2, 4 into the registive status.

    OXIDE SUPERCONDUCTIVE FILM, ELECTRIC DEVICE USING SAME AND THEIR PRODUCTION
    8.
    发明专利
    OXIDE SUPERCONDUCTIVE FILM, ELECTRIC DEVICE USING SAME AND THEIR PRODUCTION 失效

    公开(公告)号：JP2000264788A

    公开(公告)日：2000-09-26

    申请号：JP6600099

    申请日：1999-03-12

    Applicant: INT SUPERCONDUCTIVITY TECH ,  KOBE STEEL LTD

    Inventor： TAKAGI TOSHIAKI ,  BUN TAKEKUNI ,  MACHI TAKAHITO ,  HASHIMOTO KENJI ,  TAKAHASHI YASUO ,  MORISHITA TADATAKA ,  HIRABAYASHI IZUMI ,  KOSHIZUKA NAOKI

    IPC: C30B29/22 ,  C30B15/00 ,  C30B19/00 ,  C30B19/06 ,  H01L39/24

    Abstract: PROBLEM TO BE SOLVED: To obtain a bicrystal oxide superconductive film free from sinuosity at the joining interface by forming a film having a long straight chain joining interface on a bicrystal substrate by a liquid phase growth method. SOLUTION: The length of the straight chain joining interface is >=1 μm. Starting materials forming an REBaCuO (RE is rate earth elements such as Y, Nd and Sm) type oxide superconductor are put in a furnace 1 and a bicrystal substrate 3 of MgO or the like with a thin film of a seed crystal formed on the surface is disposed just above the starting materials. The starting materials are melted by heating to form a melt 2, the substrate 3 which is slowly pulled up under rotation by a rotating shaft 5 is immersed in the surface of the melt and a crystal is grown on the substrate. The objective superconductive film having a joining interface at the same position as the substrate 3 and having the same joining tilt and (θ) as the substrate is formed on the substrate. An electronic device such as a switching element, a current limiting device or SQUID is obtained by using the superconductive film.

    HIGH-TEMPERATURE SUPERCONDUCTING JOSEPHSON JUNCTION AND MANUFACTURE THEREOF
    9.
    发明专利
    HIGH-TEMPERATURE SUPERCONDUCTING JOSEPHSON JUNCTION AND MANUFACTURE THEREOF 失效

    公开(公告)号：JP2000150974A

    公开(公告)日：2000-05-30

    申请号：JP16202599

    申请日：1999-06-09

    Applicant: NEC CORP ,  INT SUPERCONDUCTIVITY TECH

    Inventor： SATO TETSURO ,  BUN TAKEKUNI ,  KOSHIZUKA NAOKI ,  TANAKA SHOJI

    IPC: H01L39/22 ,  H01L39/24

    Abstract: PROBLEM TO BE SOLVED: To provide a high-temperature superconducting Josephson junction which is uniform and excellent in characteristics by a method, wherein a barrier layer uniform in thickness and composition is formed keeping high in reproducibility. SOLUTION: This manufacturing method comprises a first step a first superconducting layer 2 is formed on a substrate 1, a second step where an insulating film 5 is formed on the first conducting layer 2, a third step where the insulating film 5 is etched so as to be provided with a slope, a fourth step where the first superconducting layer 2 is etched so as to be provided with a slope using the etched insulating film 5 as a mask, a fifth step where a barrier layer 3 is formed on the surface of the slope, and a sixth step where a second superconducting layer 4 is formed on the barrier layer 3 and the slope of the insulating layer 5.

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