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公开(公告)号：JP2001237466A
公开(公告)日：2001-08-31
申请号：JP2000046068
申请日：2000-02-23
Applicant: FUJITSU LTD , INT SUPERCONDUCTIVITY TECH
Inventor： ISHIMARU YOSHIYASU , YOSHIDA AKIRA
Abstract: PROBLEM TO BE SOLVED: To achieve a laminated type IEJ junction, without having to creating a mesa structure, since the deterioration of the film quality of an interlayer insulation film cannot be avoided due to the regulation of deposition temperature, in a process for utilizing the mesa structure when creating the lamination type IEJ junction regarding a high-temperature superconducting device. SOLUTION: In the laminated structure of a YBCO thin film 12, an interlayer insulation film 13 that is made of In2O3, and a YBCO thin film 15 formed on an LSAT substrate 11, contact is made via a damage layer 12A that acts as the barrier layer of SNS(superconducting/normal conduction/superconducting) Josephson junction that is generated, when an opening 13A is formed in the opening 13A being formed at the YBCO thin film 12, the YBCO thin film 15, and the interlayer insulation film 13.
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公开(公告)号：JP2001155566A
公开(公告)日：2001-06-08
申请号：JP34159699
申请日：1999-12-01
Applicant: INT SUPERCONDUCTIVITY TECH , MITSUBISHI CABLE IND LTD
Inventor： MAEDA JUNYA , SEIKI SUSUMU , IZUMI TERUO , SHIOBARA TORU
Abstract: PROBLEM TO BE SOLVED: To provide a means capable of realizing an oxide superconductor jointing member superior in current carrying without using a special complicated means. SOLUTION: A final setting position with solder is determined not to close a current flowing path between joined superconducting base materials by setting layout position of the solder at 'a position to form a bridge to a face excluding butt faces of the base materials' or the like, or providing joint faces of the superconducting base materials with 'the shape of inclined opened surfaces separated from each other at least at a part of the butt faces of the base materials' or the like to obtain a joint member shown in Fig. 5 in jointing oxide superconductors with 'solder composed of an oxide superconducting material'. Further, the oxide superconductor jointing member is made to have 'a structure that the base materials are jointed through the oxide superconducting material as a jointing material on their faces at least excluding their butt faces'.
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公开(公告)号：JP2001119300A
公开(公告)日：2001-04-27
申请号：JP29454099
申请日：1999-10-15
Applicant: TOSHIBA CORP , INT SUPERCONDUCTIVITY TECH , NEC CORP , HITACHI LTD , FUJITSU LTD
Inventor： HASHIMOTO TATSUNORI , NAGASAWA SHUICHI , HASEGAWA HARUHIRO , SUZUKI HIDEO , MIYAHARA KAZUNORI , ENOMOTO YOICHI
Abstract: PROBLEM TO BE SOLVED: To provide a superconducting sigma delta modulator which realize a high-resolution AD converter. SOLUTION: In the superconducting sigma delta converter, it is necessary that a time constant Ls/Rs of an integrator is sufficiently high in order to avoiding evils like a failure to raise the resolution or degradation of the linearity, however Ls cannot be made sufficiently large because it is necessary that a feedback quantity Φ0/L0 (Φ0: magnetic flux quantum) is not buried in the thermal noise from an overdamping Josephson element 4 of a comparator. In order to resolve this problem, a Josephson transmission line including an underdamping Josephson element is used as a magnetic flux quantum pair generation circuit 20; and when the Josephson element 4 of the comparator exceeds a threshold to output one single magnetic flux quantum, the magnetic flux quantum is multiplied in this circuit 20 to feed back plural single magnetic flux quanta to the integrator. Ls and the time constant are made sufficiently large in accordance with by increase in the feedback quantity to realize a high resolution.
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公开(公告)号：JP2001080994A
公开(公告)日：2001-03-27
申请号：JP25230999
申请日：1999-09-06
Applicant: INT SUPERCONDUCTIVITY TECH , ISHIKAWAJIMA HARIMA HEAVY IND
Inventor： IZUMI TERUO , KOYAMA SATOSHI , SHIOBARA TORU , TANAKA SHOJI , EGAMI MASAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a high strength oxide superconducting laminated substrate which has an oxide superconducting crystal substrate that is provided with high flatness and high crystal properties and used as an electronic device substrate for forming on it films such as insulation film and electrically conductive film for a circuit, and is capable of preventing cracks due to heat treatment in the formation of such an insulating film or conductive film on the oxide superconducting crystal substrate, from being caused in the crystal substrate. SOLUTION: This oxide superconducting laminated substrate 1 is manufactured by joining an oxide superconducting crystal substrate 3 having high flatness and high crystal properties to a high strength reinforcing crystal substrate 5, while interposing between them, an intermediate layer 7 consisting of a material having a lower melting point than that of the constituent oxide superconducting single crystal or polycrystal of the oxide superconducting crystal substrate 3.
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15.发明专利
公开(公告)号：JP2001010879A
公开(公告)日：2001-01-16
申请号：JP17529099
申请日：1999-06-22
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： TOMITA MASARU , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To obtain an oxide superconductor capable of securing intense caught magnetic field and of maintaining its performance over a long period without being affected by internal/external force such as thermal stress and corrosive environment, and to provide a method for producing such a superconductor. SOLUTION: This oxide superconductor is set to be such 'a construction as to consist of an oxide superconductive bulk form with its outer surface provided with a resin-impregnated cloth-adhered coating layer' or 'a construction as to furnish the surface layer of the above oxide superconductive bulk form with a layer impregnated with a resin or a resin dispersed with a filler material of low linear expansion coefficient'. This oxide superconductor is obtained, for example, by covering the surface of an oxide superconductive bulk form with a cloth followed by holding the bulk form thus covered in a reduced pressure atmosphere and then contacting it with a liquid resin or filler- included liquid resin.
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Patent Agency Ranking
公开(公告)号：JP2000299026A
公开(公告)日：2000-10-24
申请号：JP10861099
申请日：1999-04-15
Applicant: FUJIKURA LTD , TOKYO ELECTRIC POWER CO , RAILWAY TECHNICAL RES INST , SUMITOMO ELECTRIC INDUSTRIES , INT SUPERCONDUCTIVITY TECH
Inventor： KAKIMOTO KAZUTOMI , YASUHARA NATSUO , IZUMI TERUO , SHIOBARA TORU , NAKAMURA YUICHI , DAIMATSU KAZUYA , FUJINO KOZO
Abstract: PROBLEM TO BE SOLVED: To form a thick oxide superconductive layer at a large deposition rate by immersing and lifting a base material formed with two oxide intermediate layers on the surface of a high-melting point metal in a fused solution containing an oxide superconductive layer constituting element. SOLUTION: A base material 1 is a flexible tape with the thickness of 0.1-0.5 mm and made of a high-melting point metal with the melting point of 1000-2000 deg.C such as hastelloy. A first intermediate layer 2 is made of MgO or NiO, and it is hardly reacted with the base material 1 and a second intermediate layer 3 even at a high temperature of 980-1100 deg.C. The second intermediate layer 3 is made of BaZrO3, it has low reactivity with the first intermediate layer 2 and a fused solution of an oxide supercondutor, and its crystal structure is somewhat approximate to the oxide superconductor. The first intermediate layer 2 and the second intermediate layer 3 are formed at the thickness of about 1 μm by the CVD method. The master film 4 of the oxide superconductor must have has same composition as that of an oxide superconductive layer 5, and it is formed at the thickness of 0.01-1 μm by the laser deposition of Y1Ba2Cu3Oy, for example.
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公开(公告)号：JP2000256082A
公开(公告)日：2000-09-19
申请号：JP6113599
申请日：1999-03-09
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： TOMITA MASARU , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide an oxide superconductor capable of securing high trapped magnetic field and maintaining the performance for a long period of time without being affected by internal or external force such as heat stress or corrosive environment, and to provide a method for producing the same. SOLUTION: As shown in the figure as the example, the constitution of the oxide superconductor is made such a constitution that 'the oxide superconductor has an impregnated resin layer and is covered with a resin layer containing a dispersed fine filler material having a small coefficient of linear thermal expansion', or 'the oxide superconductor has an impregnated layer of a resin containing a dispersed fine filler material at the surface layer part' or 'the oxide superconductor has an impregnated layer of a resin containing a dispersed fine filler material and the external surface of it is covered by a resin containing a dispersed fine filler material'. Further, an appropriate amount of Ag may be suitably added to the bulk body. This oxide superconductor is obtained by bringing into contact with a liquid resin or a liquid resin containing the filler material under a reduced pressure atmosphere to infiltrate the resin, and further coating the external surface of the resultant material with the liquid resin containing the filler material, or subjecting the resultant material to other appropriate treatments.
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公开(公告)号：JP2000091655A
公开(公告)日：2000-03-31
申请号：JP26002598
申请日：1998-09-14
Applicant: FUJITSU LTD , NEC CORP , INT SUPERCONDUCTIVITY TECH
Inventor： ISHIMARU YOSHIYASU , MIURA SADAHIKO , O FUKUNIN , TANAKA NOBUE , MORISHITA TADATAKA
IPC: H01L39/24
Abstract: PROBLEM TO BE SOLVED: To obtain an excellent surface flatness by preparing a laminated substrate made by forming an oxide superconductor film having a specified thickness or above on an insulator substrate by a liquid phase epitaxial method, and then mechanically polishing the oxide superconductor film on a rotating polishing disc using a specified polishing liquid. SOLUTION: An MgO substrate 15 is brought into contact with the surface of a YBCO melted liquid in a crucible 11 and is gradually pulled up while being turned, to form a YBCO film (oxide superconductor film) 16 of the thickness of 1 μm or above on the surface of the MgO substrate 15. The YBCO film 16 having an unevenness formed on the surface of the MgO substrate 15 is mechanically polished by a grinding disc 25 to be flattened. Since the YBCO film 16 deteriorates in its characteristics when it is brought into contact with water, use of water should be avoided. Therefore, a liquid containing no water dispersed with polishing grains having the average grain diameter of 0.05 μm or below is used for a polishing liquid. For example, an oil slurry made by dispersing alumina grains in hydrocarbon-system oil mainly of petroleum naphtha is used.
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公开(公告)号：JPH11228137A
公开(公告)日：1999-08-24
申请号：JP3301998
申请日：1998-02-16
Applicant: SUMITOMO ELECTRIC INDUSTRIES , INT SUPERCONDUCTIVITY TECH
Inventor： HAYASHI NORIKATA , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide a producing method of an oxide superconductive bulk body capable of being utilized for or a flywheel or the like. SOLUTION: A process for preparing a formed body 14 containing a 123 component expressed by a composition formula of ABa2 Cu3 Ox (A represents one kind selected from a group composed of Nd, Sm, Eu, Gd, Dy, Y, Ho and Er) and a 211 component expressed by a composition formula of A2 BaCuO5 or a 422 component expressed by a composition formula of A4 Ba2 CU2 O10 , a process for melting the 123 component in the formed body 14, a process for allowing the upper surface of the formed body 14 to contact with a seed crystal 13 and a process for obtaining a single domain oxide super conductive bulk body by solidifying the 123 component are provided. The temp. gradient G1 is given to the formed body so that the temp. of the edge becomes higher than that of the center. And the temp. gradient G2 is given so that the temp. of the back surface becomes higher than that of the upper surface. When the cooling rate in the side face direction is expressed by R1 and the cooling rate in the back surface direction is expressed by R2 , a relational equation of R1 /G1
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公开(公告)号：JPH11130596A
公开(公告)日：1999-05-18
申请号：JP29260397
申请日：1997-10-24
Applicant: INT SUPERCONDUCTIVITY TECH , KANSAI ELECTRIC POWER CO
Inventor： HATTORI OSAMU , KOYAMA SATOSHI , SHIOBARA TORU
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing RE123-based single crystal or the like, excellent in crystallinity, having definite single crystal composition before and after production of crystal, capable of continuously producing for a long time and simply controlling temperature. SOLUTION: This method for producing RE123-based single crystal comprises continuously pulling and growing RE123-based single crystal at solution surface temperature which is a temperature lower by 2-20 deg.C than peritectic crystallization temperature from the surface of solution obtained by dissolving a solution raw material such as 1 or 2 or more RE elements (RE element is Y, La, Nd, Sm, Eu, Gd, Ho or Yb) as a solute into solvent melt of the formula nBaO-mCuO in which (n/m) ratio is (3/7) to (4/5). In this case, the solution surface temperature in melting of solution raw material is set so as to be same as solution surface temperature in pulling up and growing and oxygen partial pressure in melting is set to be lower than oxygen partial pressure in pulling up and growing.
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