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公开(公告)号：JP2000281336A
公开(公告)日：2000-10-10
申请号：JP2000063319
申请日：2000-03-03
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YAMAMOTO FUMIKO , KO YASUYUKI , TAJIMA SETSUKO
Abstract: PROBLEM TO BE SOLVED: To produce 'an oxide superconductor containing Ba as a constituent element' which exhibits stably high superconductor characteristics and is free from the deterioration with the passage of time. SOLUTION: It was found that the cause of the deterioration of the characteristics of a Ba-containing oxide superconductor (e.g. Hg-or Nd-system can be eliminated by lowering the content of the impurity carbon to be less than a prescribed level, which impurity carbon is mainly introduced through a raw material for feeding Ba. Based on this fact, the characteristics of the Ba-containing oxide superconductor are improved by allowing the superconductor to have such a constitution that the content of the impurity carbon is controlled to be not more than 2.0 atom.%. The Ba-containing oxide superconductor is produced by using, as the Ba-supplying raw material, BaO in which the content of the impurity carbon is reduced to be not more than 0.5% and further mixing the raw materials and synthesizing the product in a dry atmosphere in which the content of the gas containing carbon is restricted.
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公开(公告)号：JP2000203983A
公开(公告)日：2000-07-25
申请号：JP548499
申请日：1999-01-12
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： TOMIMOTO KOKICHI , TAJIMA SETSUKO
Abstract: PROBLEM TO BE SOLVED: To provide a molten oxide producing technique by which the outflow of a melt from a crucible during the formation of the molten oxide as the raw material for producing a superconductor, etc., is conveniently and efficiently prevented. SOLUTION: A crucible 11 is placed on a support 1 so that >=2 single crystal polyhedrons such as single-crystal cubes, etc., are vertically stacked on one another without the edges of the adjacent polyhedrons coinciding, crossing or in contact with one another. An oxide 13 is heated and melted in the crucible to form a molten oxide, and the molten oxide is then crystallized to produce the oxide crystals of a superconductor, etc.
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公开(公告)号：JP2002037626A
公开(公告)日：2002-02-06
申请号：JP2000231379
申请日：2000-07-27
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： SERGEI LEE , TAJIMA SETSUKO
Abstract: PROBLEM TO BE SOLVED: To provide an efficient and stable method for manufacturing at low cost a bismuth type high temperature superconductor of Bi-2223 single phase or Bi/Pb-2223 single phase and being free of the second phase. SOLUTION: A raw material powder mixture (a powder mixture of oxides and carbonates) having the same blending ratio of each amount of Bi, Sr, Ca and Cu or Pb contained in the raw material for calcination, as the stoichiometrical ratio in a superconducting crystal, Bi2Sr2Ca2Cu3Oz or (Bi, Pb)2 Sr2Ca2Cu3Oz, is calcinated using KCl as flux. Calcination is preferably practiced using precalcinated raw materials and/or keeping the calcination temperature constant.
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Patent Agency Ranking
公开(公告)号：JP2000256012A
公开(公告)日：2000-09-19
申请号：JP5878499
申请日：1999-03-05
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YAMAMOTO FUMIKO , KO YASUYUKI , TAJIMA SETSUKO
Abstract: PROBLEM TO BE SOLVED: To improve the superconductive properties by suppressing deterioration and deterioration with the passage of time in the semiconductor properties. SOLUTION: In an oxide superconductor containing Ba as a constituent element, the impurity carbon content is controlled to 0.3-2.0%. Further, in the production process of the oxide superconductor containing Ba as the constituent element, purified BaO and other raw materials are mixed in a globe box filled with a high purity inert gas having a carbon dioxide content of =99.99% at a pressure of =950 deg.C to form BaO having an impurity carbon content of
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公开(公告)号：JPH11189415A
公开(公告)日：1999-07-13
申请号：JP35992197
申请日：1997-12-26
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YAMAMOTO FUMIKO , HASANOWA NERY , TAJIMA SETSUKO
Abstract: PROBLEM TO BE SOLVED: To provide a bismuth oxide with least mismatch with a substrate, to provide an oxide superconductor, and to provide a method for producing the same. SOLUTION: This oxide having a perovskite type structure comprises calcium, potassium or rubidium, strontium, bismuth and oxygen, and is expressed by the formula: Ca1-x-y Kx Sry BiO3 [(x) is 0.3-0.8; (y) is 0-0.5] or Ca1-x-y Rbx Sry BiO3 [(x) is 0.3-0.8; (y) is 0-0.5]. The oxide superconductor having a perovskite type structure comprises calcium, potassium or rubidium, strontium, bismuth and oxygen, and is expressed by the formula: Ca1-x-y Kx Sry BiO3 or Ca1-x-y Rbx Sry BiO3 [(x) is 0.4-0.7; (y) is 0-0.5; (x)+(y) does not exceed 1.0].
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6.发明公开MGB sb 2 /sb SINGLE CRYSTAL AND ITS PRODUCTION METHOD, AND SUPERCONDUCTIVE MATERIAL CONTAINING MGB sb 2 /sb SINGLE CRYSTAL 有权MgB2超导单晶的生产和这种单一的含液晶材料SUPERKONDUKTIVES
公开(公告)号：EP1310584A4
公开(公告)日：2009-02-11
申请号：EP02728094
申请日：2002-05-21
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： LEE SERGEY ROMANOVICH , YAMAMOTO AYAKO , TAJIMA SETSUKO
CPC classification number: C01B35/04 , B01J3/062 , B01J2203/0605 , B01J2203/0645 , B01J2203/068 , Y10T29/49014 , Y10T29/49117
Abstract: Means for producing an MgB 2 single crystal and a useful superconductive material using the anisotropic superconductive characteristics thereof. A mixture material of Mg and B or a precursor containing MgB 2 microcrystals produced by reacting them is brought into contact with hexagonal crystal BN, and they are held at high temperature (1300 ° C to 1700 ° C) under high pressure (3 to 6 GPa) so as to grow anisotropic MgB 2 single crystals having superconductive properties through intermediate products. The single crystal has a feature that the irreversible magnetic field is 95% or more of the second critical magnetic field depending on the direction of the applied magnetic field, and therefore can be a superconductive material having excellent characteristics by adjusting the crystal orientation. It is advantageous for single crystal growth to be coexistent with a reducer such as Mg during the reaction or by establishing a temperature gradient in the melt.
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公开(公告)号：DE60032404T2
公开(公告)日：2007-10-11
申请号：DE60032404
申请日：2000-03-03
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YAMAMOTO AYAKO , HU WEI-ZHI , TAJIMA SETSUKO
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公开(公告)号：DE60032404D1
公开(公告)日：2007-02-01
申请号：DE60032404
申请日：2000-03-03
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YAMAMOTO AYAKO , HU WEI-ZHI , TAJIMA SETSUKO
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