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    PRODUCTION OF HIGH-TEMPERATURE SUPERCONDUCTING CRYSTALLIZED GLASS
    3.
    发明专利
    PRODUCTION OF HIGH-TEMPERATURE SUPERCONDUCTING CRYSTALLIZED GLASS 失效

    公开(公告)号：JPH02188445A

    公开(公告)日：1990-07-24

    申请号：JP900089

    申请日：1989-01-17

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： TANIGAWA HIDEO ,  OGURA TORU ,  MATSUBARA ICHIRO ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU

    IPC: C03C10/02 ,  C03C3/12 ,  C03C3/253 ,  C03C4/14

    Abstract: PURPOSE:To obtain the high-temp. superconducting crystallized glass capable of being easily worked into various forms, e.g. film, ribbon, and filament, while keeping its characteristic as a superconductor by using a specified glass composition, melting the composition by heating, and crystallizing the molten composition by heat treatment. CONSTITUTION:From 0.02 to 0.08 pts.wt. of Au or Pt is added to 100 pts.wt. of a mixed powder contg., by weight, 3.7-4.9% GeO2 or Ge2O3, 39.0-39.5% Bi2O3, 20.1-20.3% SrO2, 9.4-9.5% CaO, and 26.6-27.0% CuO. The mixture is heated and melted to produce glass, and the glass is crystallized by heat treatment. Colloidal Au or Pt has to be incorporated into the glass as the crystalline nucleus. Accordingly, Au or Pt is preferably incorporated into the starting raw mixture in the form of the aq. soln. of chloroauric acid (HAuCl4.4H2O) or hexachloroplatinic acid (H2PtCl6.6H2O).

    PRODUCTION OF SUPERCONDUCTING FIBROUS CRYSTAL
    4.
    发明专利
    PRODUCTION OF SUPERCONDUCTING FIBROUS CRYSTAL 失效

    公开(公告)号：JPH09157097A

    公开(公告)日：1997-06-17

    申请号：JP34554495

    申请日：1995-12-08

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  FUNAHASHI RYOJI ,  OGURA TORU ,  UENO KAZUO ,  ISHIKAWA HIROSHI

    IPC: C01G1/00 ,  C01G29/00 ,  C30B1/02 ,  C30B29/22 ,  C30B29/62 ,  H01B12/00 ,  H01L39/12

    Abstract: PROBLEM TO BE SOLVED: To efficiently obtain fibrous crystals having Bi2 Sr2 CaCu2 O8 structure by rapidly cooling a melt consisting of Bi, Sr, Ca, Cu, Al and O, heat-treating and firing the resultant glass precursor under specified conditions. SOLUTION: Starting materials are mixed so as to give BiSrCaCu2 Ox and this mixture is put in an alumina crucible and heated to a high temp. By this heating, the mixture is melted and a proper amt. of Al is leached from the crucible to prepare a melt consisting of Bi, Sr, Ca, Cu, Al and O. This melt is rapidly cooled and the resultant glass precursor is heat-treated at 850-870 deg.C for 20-60hr and then fired at 840-880 deg.C for 10-500hr to obtain the objective superconducting fibrous crystals having Bi2 Sr2 CaCu2 O8 structure (2212 phase). When the crystals are used, a superconducting material having high critical current density can be produced.

    SUPERCONDUCTING SINGLE CRYSTAL AND ITS PRODUCTION
    5.
    发明专利
    SUPERCONDUCTING SINGLE CRYSTAL AND ITS PRODUCTION 失效

    公开(公告)号：JPH0465396A

    公开(公告)日：1992-03-02

    申请号：JP17712490

    申请日：1990-07-03

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  TANIGAWA HIDEO ,  OGURA TORU ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU ,  KAWAI TOMOJI

    IPC: C01G29/00 ,  C01G1/00 ,  C30B1/02 ,  C30B29/22 ,  C30B33/02 ,  H01L39/12

    Abstract: PURPOSE:To raise the critical temp. above the temp. of liq. oxygen by embedding a single crystal having a Bi2Sr2CaCu2O8 structure(2212 phase) in a specified oxide powder and heat-treating the powder. CONSTITUTION:The raw materials are mixed so that Bi=1.00, Sr=0.5-1.5, Ca=1.0-3.0, Cu=1.0-5.0 and Pb=0.2-1.0 in the atomic compositional ratio, and the mixture is sintered at 800-860 deg.C for 5-100 hr in an oxygen atmosphere and then pulverized to obtain an oxide powder. A single crystal consisting of Bi, Sr, Ca, Cu and O and having a Bi2Sr2CaCu3O8 structure(2212 phase) or a single crystal consisting of Bi, Sr, Cu and O and having a Bi2Sr2Cu1O6 structure (2201 phase) is then embedded in the oxide powder, and the powder is heat-treated at 830-860 deg.C for 50-200 hr to obtain a superconducting single crystal with the atomic compositional ratio expressed by the formula (0

    SUPERCONDUCTING FIBROUS CRYSTAL, SINGLE CRYSTAL AND PRODUCTION THEREOF
    7.
    发明专利
    SUPERCONDUCTING FIBROUS CRYSTAL, SINGLE CRYSTAL AND PRODUCTION THEREOF 失效

    公开(公告)号：JPH06107497A

    公开(公告)日：1994-04-19

    申请号：JP27325191

    申请日：1991-09-24

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  OGURA TORU ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU ,  KAWAI TOMOJI

    IPC: C30B29/22 ,  C01G1/00 ,  C30B29/62

    Abstract: PURPOSE:To obtain a superconducting fibrous crystal of Bi2Sr2Ca2Cu3O10 having high critical temp. by burying the fibrous crystal of Bi2Sr2CaCu2O8 structure or the like into an oxide powder having a specific composition containing Li and heat treating. CONSTITUTION:A fibrous crystal composed of Bi, Sr, Ca, Cu and O and having Bi2Sr2CaCu2O8 structure (2212 phase) or a fibrous crystal composed of Bi, Sr, Cu and O and having Bi2Sr2CuO6 structure (2201 phase) is prepared. Next, the fibrous crystal is buried into the oxide power having the atomic composition ratio of Bi=1, Sr=0.5-1.5, Ca=1-3, Cu=1-5, Pb=0.2-1 and Li=0.05-0.25. Next, by heat-treating at 833-845 deg.C, the superconducting fibrous crystal having the atomic composition ratio expressed by the formula (wherein 0

    SUPERCONDUCTING FIBROUS CRYSTAL AND PRODUCTION THEREOF
    8.
    发明专利
    SUPERCONDUCTING FIBROUS CRYSTAL AND PRODUCTION THEREOF 失效

    公开(公告)号：JPH02252621A

    公开(公告)日：1990-10-11

    申请号：JP7364189

    申请日：1989-03-23

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  TANIGAWA HIDEO ,  OGURA TORU ,  YAMASHITA HIROSHI ,  KINOSHITA MINORU

    IPC: C01G29/00 ,  C01G1/00 ,  C30B9/00 ,  C30B11/00 ,  C30B25/00 ,  C30B29/22 ,  C30B29/64 ,  D01F9/08

    Abstract: PURPOSE:To obtain a bendable superconducting fibrous crystal by adding a specific amount of a specific element as an auxiliary component to a raw material for a Bi2Sr2CaCu2Ox superconductor, melting and then quenching the mixture and heat-treating the obtained solid in oxygen gas stream. CONSTITUTION:A superconducting fibrous crystal having atomic ratios of Bi2Sr2 CaCu2Ox (x is 7.8-8.2) is produced by preparing a molten mixture having atomic ratios of Bi=1, Sr=0.7 to 1.3, Ca=0.7 to 1.5. Cu=1.5 to 2.5, O=3.5 to 8.8 and M=0.15 to 0.35 (M is one or more elements selected from Pb, Sn, Sb, In, Cd, Ga, Ge, K and Na), quenching the molten mixture and heat-treating the obtained solid in oxygen gas stream. The obtained superconducting fibrous crystal has a merit of bendability and is suitable e.g. as a magnet material for the generation of magnetic field.

    SUPERCONDUCTIVE WHISKER COMPOSITE PRODUCT AND ITS PRODUCTION
    9.
    发明专利
    SUPERCONDUCTIVE WHISKER COMPOSITE PRODUCT AND ITS PRODUCTION 失效

    公开(公告)号：JPH0812422A

    公开(公告)日：1996-01-16

    申请号：JP17318494

    申请日：1994-06-30

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： FUNAHASHI RYOJI ,  MATSUBARA ICHIRO ,  OGURA TORU ,  YAMASHITA HIROSHI ,  HAYAKAWA JUNJI ,  ISHIKAWA HIROSHI

    IPC: C04B35/45 ,  C01G1/00 ,  C01G29/00 ,  C30B29/62 ,  H01B12/00 ,  H01B12/02

    Abstract: PURPOSE:To obtain a highly densified superconductive product containing highly oriented superconductive whiskers each comprising a single crystal excellent in the superconductive characteristics and solving the problem of weak bonds on the particle boundary. CONSTITUTION:The oxide superconductive whisker composite product comprises oxide superconductive whiskers and oxide superconductive powdery crystals. The superconductive whiskers and the superconductive powdery crystals both comprise Bi, Sr, Ca, Cu and O, and have a Bi2Sr2CaCu2O8 structure. The content of the superconductive whiskers is 5-40wt.% based on the whole weight of the whisker composite product. The method for producing the superconductive whisker composite product comprises hot-pressing and sintering a mixture comprising (a) 5-40wt.% of oxide superconductive whiskers comprising the Bi, Sr, Ca, Cu and 0 and having the Bi2Sr2CaCu2O8 structure and (b) 95-60wt.% of oxide superconductive powdery crystals comprising the Bi, Sr, Ca, Cu and 0 and having the Bi2Sr2CaCu2O8 structure.

    SUPERCONDUCTING FIBROUS CRYSTAL AND ITS PRODUCTION
    10.
    发明专利
    SUPERCONDUCTING FIBROUS CRYSTAL AND ITS PRODUCTION 失效

    公开(公告)号：JPH0465395A

    公开(公告)日：1992-03-02

    申请号：JP17712390

    申请日：1990-07-03

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  TANIGAWA HIDEO ,  YAMASHITA HIROSHI ,  OGURA TORU ,  KINOSHITA MINORU ,  KAWAI TOMOJI

    IPC: C01G29/00 ,  C01G1/00 ,  C30B29/22 ,  C30B29/62 ,  H01L39/12

    Abstract: PURPOSE:To raise the critical temp. above the temp. of liq. oxygen by embedding a fibrous crystal having a Bi2Sr2Cu1O6 structure (2201 phase) in a specified oxide powder and heat-treating the powder. CONSTITUTION:The raw materials are mixed so that Bi=1.00, Sr=0.5-1.5, Ca=1.0-3.0, Cu=1.0-5.0 and Pb=0.2-1.0 in the atomic compositional ratio. The mixture is sintered at 800-860 deg.C for 5-100 hr in an oxygen atmosphere and then pulverized to obtain an oxide powder. A fibrous crystal consisting of Bi, Sr, Ca, Cu and O and having a Bi2Sr2Ca1Cu2O8 structure (2212 phase) or a fibrous crystal consisting of Bi, Sr, Cu and O and having a Bi2Sr2Cu1O6 structure (2201 phase) is then embedded in the oxide powder, and the powder is heat- treated at 830-860 deg.C for 50-200 hr to obtain the superconducting fibrous crystal with the atomic compositional ratio expressed by the formula (0

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