Alloy Or Metallic: (class 420,420/901) Patents (Class 505/805)
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Patent number: 7445681Abstract: There are provided an intermetallic-compound superconductor that is high in superconducting transition temperature, and an alloy superconductor that is high in superconducting transition temperature and excels in malleability and ductility, as well as a method of making such a superconductor with good reproducibility and at a low cost of manufacture. This entirely new intermetallic compound superconductor is made of magnesium (Mg) and beryllium (Be) and has a chemical composition expressed by formula: Mg1Be2, has a hexagonal AlB2 type crystallographic structure and has a superconducting transition temperature (Tc) of 35 K. An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 35 K and being low in specific resistance for normal conduction at a temperature ranging from the superconducting transition temperature to a room temperature.Type: GrantFiled: March 8, 2002Date of Patent: November 4, 2008Assignee: Japan Science and Technology AgencyInventors: Jun Akimitsu, Yuji Zenitani, Takahiro Muranaka, Kazunobu Kadomura
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Patent number: 7219412Abstract: The invention includes superconducting titanium-containing compositions having less than 200 ppm, by weight, of a combined total of interstitial materials selected from the group consisting of nitrogen, oxygen, carbon and hydrogen. The invention also includes methods of forming superconducting titanium-containing superconducting compositions containing less than 100 ppm, by weight, of a combined total of interstitial materials selected from the group consisting of nitrogen, oxygen, carbon and hydrogen.Type: GrantFiled: June 2, 2004Date of Patent: May 22, 2007Assignee: Honeywell International Inc.Inventors: Yun Xu, Stephen P. Turner, Mathew S. Cooper, Wei Guo, David B. Love, Edward Cawley
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Patent number: 7172993Abstract: There are provided an intermetallic compound superconductor that is high in superconducting transition temperature, and an alloy superconductor that is high in superconducting transition temperature and excels in malleability and ductility, as well as a method of making such a superconductor with good reproducibility and at a low cost of manufacture. This entirely new intermetallic compound superconductor is made of magnesium (Mg) and boron (B) and has a chemical composition expressed by formula: Mg1B2, has a hexagonal AlB2 type crystallographic structure and has a superconducting transition temperature (Tc) of 39 K. An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 39 K. In the method of manufacture, a Mg containing feedstock powder and a B containing feedstock powder are mixed together to form a mixture thereof which is, e.g., hot pressed to produce a semiconductor product.Type: GrantFiled: August 12, 2005Date of Patent: February 6, 2007Assignees: Japan Science and Technology AgencyInventors: Jun Akimitsu, Yuji Zenitani, Takahiro Muranaka, Norimasa Nakagawa, Jun Nagamatsu
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Patent number: 6956011Abstract: There are provided an intermetallic compound superconductor that is high in superconducting transition temperature, and an alloy superconductor that is high in superconducting transition temperature and excels in malleability and ductility, as well as a method of making such a superconductor with good reproducibility and at a low cost of manufacture. This entirely new intermetallic compound superconductor is made of magnesium (Mg) and boron (B) and has a chemical composition expressed by formula: Mg1B2, has a hexagonal AlB2 type crystallographic structure and has a superconducting transition temperature (Tc) of 39 K. An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 39 K. In the method of manufacture, a Mg containing feedstock powder and a B containing feedstock powder are mixed together to form a mixture thereof which is, e.g., hot pressed to produce a semiconductor product.Type: GrantFiled: July 24, 2001Date of Patent: October 18, 2005Assignees: Japan Science and Technology AgencyInventors: Jun Akimitsu, Yuji Zenitani, Takahiro Muranaka, Norimasa Nakagawa, Jun Nagamatsu
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Patent number: 6511943Abstract: A process of preparing superconducting magnesium diboride powder by heating an admixture of solid magnesium and amorphous boron powder or pellet under an inert atmosphere in a Mg:B ratio of greater than about 0.6:1 at temperatures and for time sufficient to form said superconducting magnesium diboride. The process can further include exposure to residual oxygen at high synthesis temperatures followed by slow cooling. In the cooling process oxygen atoms dissolved into MgB2 segregated to form nanometer-sized coherent Mg(B,O) precipitates in the MgB2 matrix, which can act as flux pinning centers.Type: GrantFiled: March 13, 2002Date of Patent: January 28, 2003Assignee: The Regents of the University of CaliforniaInventors: Adriana C. Serquis, Yuntian T. Zhu, Frederick M. Mueller, Dean E. Peterson, Xiao Zhou Liao
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Patent number: 6096263Abstract: A novel intermetallic superconductor with surprisingly high transition temperature is disclosed. The material comprises B and C, and can form a bulk superconductor. Exemplary of the novel superconductors is material of nominal composition YPd.sub.5 B.sub.3 C.sub.x, with x chosen such that the C:B ratio is in the range 0.05-2. An exemplary bulk sample of such composition has T, (onset) of 22.5 K, with more than 15 volume % of the sample being superconducting.Type: GrantFiled: December 10, 1993Date of Patent: August 1, 2000Assignee: Lucent Technologies Inc.Inventors: Robert Joseph Cava, James Joseph Krajewski
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Patent number: 6074603Abstract: A novel intermetallic superconductor with surprisingly high transition temperature is disclosed. The material comprises B and C, and can form a bulk superconductor. Exemplary of the novel superconductors is material of nominal composition YPd.sub.5 B.sub.3 C.sub.x, with x chosen such that the C:B ratio is in the range 0.05-2. An exemplary bulk sample of such composition has T.sub.c (onset) of 22.5 K, with more than 15 volume % of the sample being superconducting.Type: GrantFiled: July 12, 1999Date of Patent: June 13, 2000Assignee: Lucent Technologies Inc.Inventors: Robert Joseph Cava, James Joseph Krajewski
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Patent number: 6066270Abstract: The production of compact molded bodies of rare-earth transition-metal boron carbide and boron nitride compounds configured so as to avoid a selective evaporation of individual components in the production process and enable an exact adjustment of the desired stoichiometry. The process is characterized in thata) a powder mixture with particles sizes from 1 to 250 .mu.Type: GrantFiled: January 19, 1999Date of Patent: May 23, 2000Assignee: Institut fuer Festkoerper- und Werkstofforschung Dresden e.V.Inventors: Juergen Eckert, Kathrin Jost, Oliver De Haas, Michael Seidel, Ludwig Schultz
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Patent number: 5470530Abstract: Material comprising an effective amount of a novel intermetallic bulk superconductor compound is disclosed. The compound has the composition LnNi.sub.2 B.sub.2 C, with Ln being Y or a rare earth (atomic number 57-71), preferably Tm, Er, Ho or Ln. A compound of composition XPt.sub.2 B.sub.2 C, with X=Y and/or La, is also a superconductor.Type: GrantFiled: January 5, 1994Date of Patent: November 28, 1995Assignee: AT&T IPM Corp.Inventors: Robert J. Cava, Theo Siegrist
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Patent number: 5413755Abstract: A novel intermetallic superconductor with surprisingly high transition temperature is disclosed. Exemplary of the novel superconductor is material of overall composition Y.sub.1.5 Pd.sub.4.5 B.sub.4. A bulk sample of that composition has T.sub.c (onset) of 22.6K, with about 0.5 volume % of the sample being superconducting.Type: GrantFiled: October 26, 1993Date of Patent: May 9, 1995Assignee: AT&T Corp.Inventor: Robert J. Cava
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Patent number: 5321276Abstract: A superconducting tunnel junction radiation sensing device includes first and second superconductor electrodes and a tunnel barrier layer interposed therebetween. The tunnel barrier layer is made up of a thin-wall portion and a thick-wall portion each formed of a semiconductor or an insulator, and each having opposite surfaces respectively contacting the first and second superconductor electrodes, and each extending adjacent each other in a same horizontal plane between the first and second electrodes. The thick-wall portion has a vertical thickness which is at least twice that of the thin-wall portion. Furthermore, the thickness of the thin-wall portion is such that a tunnel effect is enabled therethrough form the first electrode to the second electrode, and the thickness of the thick-wall portion is such that a tunnel effect is substantially prohibited therethrough from the first electrode to the second electrode.Type: GrantFiled: October 1, 1991Date of Patent: June 14, 1994Assignee: Nippon Steel CorporationInventors: Masahiko Kurakado, Atsuki Matsumura, Takeshi Kaminaga, Tooru Takahashi
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Patent number: 5306705Abstract: A non-linear superconducting junction device comprising a layer of high transient temperature superconducting material which is superconducting at an operating temperature, a layer of metal in contact with the layer of high temperature superconducting material and which remains non-superconducting at the operating temperature, and a metal material which is superconducting at the operating temperature and which forms distributed Sharvin point contacts with the metal layer.Type: GrantFiled: May 6, 1993Date of Patent: April 26, 1994Assignee: Board of Trustees of the Leland Stanford Junior UniversityInventors: Matthew J. Holcomb, William A. Little
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Patent number: 5123974Abstract: In one embodiment this invention provides a process for decreasing the resistivity of an electrical conductor.The process involves the application of high temperature and an external field to a conductor to induce a current flow and physicochemical transition in the conducting matrix.Type: GrantFiled: April 30, 1991Date of Patent: June 23, 1992Inventor: Dominic J. Giancola
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Patent number: 5100869Abstract: A metal oxide-type superconductive material is produced by a process which comprises a first step of subjecting a powder raw material containing given proportions of metal elements to be contained in said metal oxide-type superconductive material, to mechanical grinding and alloying simultaneously to obtain an alloy powder and a second step of heat-treating the alloy powder in an oxygen-containing gas atmosphere to obtain a metal oxide.The superconductive material obtained has a high density, a low porosity, a high strength and a high critical current density.Type: GrantFiled: March 10, 1989Date of Patent: March 31, 1992Assignees: Tsuyoshi Masumoto, Hoya CorporationInventors: Tsuyoshi Masumoto, Akihisa Inoue, Kunio Matsuzaki, Keiji Moroishi
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Patent number: 4985401Abstract: A superconductor is produced by electric discharge explosion flame spraying of a composite body of constituents of an immiscible alloy. The electrically discharged composite body is deposited on a substrate and the resultant alloy is oxidized to yield an oxide of the alloy having superconductive property. This process can be applied to the Ln-Ba-Cu system (Ln is at least one of the rare earth elements including Y), typically the Y.sub.1 Ba.sub.2 Cu.sub.3 - or Y.sub.2 Ba.sub.4 Cu.sub.8 system, or other immiscible alloy systems such as the Bi-(Ca, Sr)-Cu system to form an oxide thereof.Type: GrantFiled: February 24, 1989Date of Patent: January 15, 1991Assignee: Aisin Seiki Kabushiki KaishaInventors: Akira Sawaoka, Ryuichi Matsuda, Tadashi Kondo
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Patent number: 4983574Abstract: Conductor in strip, sheet or wire form with an electrical conductivity of at least 0.85.times.10.sup.6 .OMEGA..sup.-1 cm.sup.-1 at 77.degree. K. composed of a composite material of a metal matrix (1) and particles (2) composed of a high-temperature superconductor of the type RE Ba.sub.2 Cu.sub.3 O.sub.6.5-7.5 embedded therein and arranged rectilinearly in the longitudinal direction, RE generally denoting a rare earth metal. Preferably RE=yttrium and specifically the substance YBa.sub.2 Cu.sub.3 O.sub.7 and the particle diameter=0.1-100 .mu.m, more narrowly 0.2-20 .mu.m. Optionally an additional metal sheath which envelops the body forming the matrix (1).Type: GrantFiled: July 20, 1988Date of Patent: January 8, 1991Assignee: BBC Brown Boveri AGInventor: Gundolf Meyer
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Patent number: 4944183Abstract: A level gauge and measurement method are provided using a sensing element comprising a superconductive alloy represented by the formula:Mo.sub.a Ru.sub.b Z.sub.cwherein Z is phosphorous, boron, or a mixture of phosphorous and boron,b has a value of about 20 to about 40,c has a value of about 10 to about 30, anda+b+c=100.The sensing element has a superconductivity critical temperature of at least 4.2K and is useful for measuring the level of liquid helium independently of pressure fluctuations in the reservoir vessel.Type: GrantFiled: November 29, 1988Date of Patent: July 31, 1990Assignee: Aisin Seiki Kabushiki KaishaInventors: Tsuyoshi Masumoto, Akihisa Inoue, Kunio Matsuzaki, Masami Ishii, Ryohei Yabuno, Tetsuo Oka