Copper (cu) And Oxygen (o) Containing Patents (Class 505/125)
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Patent number: 5512542Abstract: A novel metallic oxide of a Ln-Ca-Sr-Ba-Cu-B-O type and a process for manufacturing such a metallic oxide. The above metallic oxide has a composition expressed by the following formula (I):(Ln.sub.1-a Ca.sub.a)(Sr.sub.2-b Ba.sub.b)(Cu.sub.3-c B.sub.c)O.sub.d(I)wherein Ln is one or more kinds of elements selected from the group consisting of Y and lanthanoid elements except for Ce and Tb and wherein the following conditions are met: 0.1.ltoreq.a.ltoreq.0.5, 0.7.ltoreq.b.ltoreq.1.7, 0.1.ltoreq.c.ltoreq.0.5, and 6.5.ltoreq.d.ltoreq.7.5. A process for manufacturing the metallic oxide has the following steps. A mixture of materials including H.sub.3 BO.sub.3 used as a starting material of B is prepared. The resultant mixture is heated at a rate of 5.degree. C. or lower per minute up to 900.degree. C. or lower. Then, it is heated in an oxygen atmosphere at a range from 900.degree.-1050.degree. C.Type: GrantFiled: August 30, 1994Date of Patent: April 30, 1996Assignee: Canon Kabushiki KaishaInventors: Tohru Den, Norio Kaneko, Tamaki Kobayashi
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Patent number: 5512538Abstract: Provided is a metal oxide material represented by the composition formula of Ln.sub.a Sr.sub.b Cu.sub.3-x M.sub.x O.sub.c, where 2.7.ltoreq.a+b.ltoreq.3.3; 0.8.ltoreq.a.ltoreq.1.2; 6.ltoreq.c.ltoreq.9; and 0.05 .ltoreq.x.ltoreq.0.7, Ln is at least one element selected from the group of elements of Y and lanthanoids or an atomic group consisting of said elements, and M is at least one element selected from the group of elements of Ti, V, Ga, Ge, Mo, W and Re or an atomic group consisting of said elements.Type: GrantFiled: June 27, 1994Date of Patent: April 30, 1996Assignee: Canon Kabushiki KaishaInventors: Tohru Den, Tamaki Kobayashi
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Patent number: 5508252Abstract: A substance which has a Cu--O plane containing crystal structure in its unit cell and which is called a Bi oxide superconductor consisting essentially of Bi, Sr, Ca, Cu, and O. Not only part of Bi but also part of Sr and/or Ca of the Bi oxide superconductor is substituted for Pb and rare earth elements (RE), respectively. The Pb substitution relaxes the structural modulation which is closely related to superconductivity of the Bi oxide superconductor and the RE substitution controls its carrier concentration. Accordingly, superconducting properties such as transition temperature and critical current density can be improved remarkably. In addition, not only oxide superconductors with excellent superconductivity can be prepared in a low oxygen content but also the surface condition of the prepared superconductors is stable.Type: GrantFiled: June 14, 1994Date of Patent: April 16, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Noburu Fukushima, Hiromi Niu, Ken Ando
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Patent number: 5506196Abstract: A super conducting material is disclosed which exhibits super conducting properties at higher temperatures than known so far. The super conducting by the invented materials is exhibited at temperatures of over 110.degree. K. Various combinations of the components exhibits superconductivities even at temperatures of around 273.degree. K. or even around 300.degree. K. Contrary to known art superconducting materials, which require super cooled conditions and are suited only to sophisticated applications, and thereby have limited applications, the materials of this inventions do not always require super cooled conditions are suited for limitless applications and can work even at room temperature conditions. While a large range of choice of materials are suggested a few important combinations are made of oxides of Bismuth, Barium and Copper. Replacement of Barium by Thallium gives additional advantages.Type: GrantFiled: August 16, 1993Date of Patent: April 9, 1996Assignee: Magnetic Power, Inc.Inventor: Mihir Sen
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Patent number: 5504226Abstract: In the production of a 124-type or 123-type superconductor by a sol-gel method using alkoxides of respective metals, the use of a compound wherein a sec-butoxy group and a hydroxy group are coordinated with a copper atom gives a superconductor composed of flat particles having a broad C plane. The dimensional ratio defined by l/d is at least 6.7 in the case of the 124-type or is at least 8.4 in the case of the 123-type. It shows a superconducting property at a liquid nitrogen temperature. This superconductor shows a higher critical current density than one obtained by a sintering method.Type: GrantFiled: November 23, 1994Date of Patent: April 2, 1996Assignees: Kyocera Corporation, International Superconductivity Technology Center, Sanyo Electric Co., Ltd.Inventors: Shinichi Koriyama, Takaaki Ikemachi, Hisao Yamauchi
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Patent number: 5502029Abstract: Superconductors using oxide superconducting materials having pinning centers inside crystal grains are enhanced in transmissible critical current density and allowed to have a high critical current density even in the magnetic field. A superconductor is produced comprising superconducting materials having a high irreversible magnetic field where the c axes of their crystals are oriented in one direction. This can be practically realized by heat-treating a superconducting material having the composition (Tl.sub.1-X1-X2 Pb.sub.X1 Bi.sub.X2)(Sr.sub.1-X3 Ba.sub.X3).sub.2 Ca.sub.2 Cu.sub.3 O.sub.9+X4 together with Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 having a tendency of growing in the form of plate crystal. Various apparatuses capable of working under cooling with liquid nitrogen let alone with liquid helium and having a high superconducting critical current density even in a high magnetic field can be produced.Type: GrantFiled: January 26, 1994Date of Patent: March 26, 1996Assignee: Hitachi, Ltd.Inventors: Toshiya Doi, Atsuko Soeta, Seizi Takeuchi, Tomoichi Kamo, Shinpei Matsuda
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Mercury-thallium-barium-calcium-strontium-copper-oxide 1223 superconductor and method of making same
Patent number: 5492885Abstract: Mercury-thallium based superconductors with the formula Hg.sub.1-x Tl.sub.x Ba.sub.2 (Ca.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.8+.delta. ; change "their preparing method, in particular characterized in that it" to and a method for preparing them. The new superconductors are prepared by reacting respective ternary oxides, such as Ba.sub.2 CuO.sub.3+x and Ca.sub.1-y Sr.sub.y CuO.sub.2, to reduce the formation of an impure phase and by substituting thallium (Ti) a portion of the mercury (Hg) conventionally used in mercury-based superconductors of similar structure, in order to thermally stabilize the superconductor and provide it with a high critical current density characteristic.Type: GrantFiled: August 17, 1994Date of Patent: February 20, 1996Assignee: Korea Research Institute of Standards and ScienceInventors: Yong H. Hur, Yong K. Park, Jong C. Park -
Patent number: 5486501Abstract: BaCuO.sub.2.5 containing precursors for superconducting materials and process for making shaped superconductor articles therefrom.Type: GrantFiled: February 9, 1994Date of Patent: January 23, 1996Inventor: Shome N. Sinha
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Patent number: 5468724Abstract: Disclosed herein are high-temperature oxide superconductors of RBa.sub.2 Cu.sub.4 O.sub.8 type, with Ba partly replaced by Sr or Ca, or with R and Ba partly replaced by Ca and Sr, respectively, as represented by the chemical composition formula of R(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8 or R(Ba.sub.1-z Ca.sub.z).sub.2 Cu.sub.4 O.sub.8 or (R.sub.1-x Ca.sub.x) (Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8. They exhibit superconductivity at high temperatures. Especially, the last one exhibits superconductivity at a higher temperature than the former two. All of them can be made with a less amount of Ba as a deleterious substance, and the first two have improved sinterability. The best results are obtained when they are produced by the process involving the hot hydrostatic pressure treatment of the mixture of raw materials at 850.degree.-1100.degree. C. in an atmosphere composed of an inert gas and oxygen. The process permits a wider selection of Ba raw materials.Type: GrantFiled: May 27, 1993Date of Patent: November 21, 1995Assignees: International Superconductivity Technology Center, Matsushita Electric Industrial Co., Ltd., Kyocera Corporation, Mitsubishi Metal Corporation, The Tokyo Electric Power Company, Incorporated, Kabushiki Kaisha Kobe Seiko ShoInventors: Takahiro Wada, Shin-ichi Koriyama, Takeshi Sakurai, Nobuo Suzuki, Takayuki Miyatake, Hisao Yamauchi, Naoki Koshizuka, Shoji Tanaka
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Patent number: 5462921Abstract: A method of fabricating a thin-film Hg-containing oxide superconductor is disclosed, which comprises forming a thin film on a substrate, said thin film containing mercury, an alkaline earth element, and copper as main components thereof; and subjecting said substrate with the thin film to a heat treatment in an oxygen-containing atmosphere at an oxygen partial pressure of 1/500 to 1/10 atm, to convert said thin film to the thin-film superconductor.Type: GrantFiled: May 9, 1994Date of Patent: October 31, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideaki Adachi, Kentaro Setsune, Koichi Mizuno
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Patent number: 5453494Abstract: Metal organic chemical vapor deposition (MOCVD) source reagents useful for formation of metal-containing films, such as thin film copper oxide high temperature superconductor (HTSC) materials. The source reagents have the formula MAyX wherein: M is a metal such as Cu, Ba, Sr, La, Nd, Ce, Pr, Sm, Eu, Th, Gd, Tb, Dy, Ho, Er, Tm Yb, Lu Bi, Tl, Y or Pb; A is a monodentate or multidentate organic ligand; y is 2 or 3; MAy is a stable sub-complex at STP conditions; and X is a monodentate or multidentate ligand coordinated to M and containing one or more atoms independently selected from the group consisting of atoms of the elements C, N, H, S, O, and F. The ligand A may for example be selected from beta-diketonates, cyclopentadienyls, alkyls, perfluoroalkyls, alkoxides, perfluoroalkoxides, and Schiff bases.Type: GrantFiled: January 18, 1994Date of Patent: September 26, 1995Assignee: Advanced Technology Materials, Inc.Inventors: Peter S. Kirlin, Duncan W. Brown, Robin A. Gardiner
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Patent number: 5446017Abstract: A superconductive oxide material having an infinite layer structure and having the following formula:A.sub.p B.sub.q Cu.sub.2 O.sub.4.+-.rwherein A and B are different and each represent an element selected from lanthanoid elements and elements belonging to Groups IA, IIA and IIIA of the Periodic Table, p is between 0.9 and 1.1, q is between 0.9 and 1.1 and r is between 0 and 0.6. The oxide material has a crystal structure belonging to a tetragonal system of P4/mmm and 1-123 having the following lattice parameters:3.8.ANG..ltoreq.a.ltoreq.4.0.ANG.7.6.ANG..ltoreq.c.ltoreq.8.0.ANG.or to an orthorhombic system of Pmmm and I-47 having the following lattice parmeters:3.8.ANG..ltoreq.a.ltoreq.3.95.ANG.3.82.ANG..ltoreq.b.ltoreq.4.0.ANG.7.6.ANG..ltoreq.c.ltoreq.8.0.ANG..Type: GrantFiled: April 12, 1993Date of Patent: August 29, 1995Assignees: Central Research Institute of Electric Power Industry, Tohoku Electric Power Co., Inc., International Superconductivity Technology CenterInventors: Takeshi Sakurai, Nobuyuki Sugii, Seiji Adachi, Michiharu Ichikawa, Yuji Yaegashi, Hisao Yamauchi, Masahiko Shimada, Hirotsugu Takizawa
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Patent number: 5444039Abstract: The oxide superconductor according to the present invention is represented by (Hg.sub.1-x Pb.sub.x)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub..delta. (0.08.ltoreq.x.ltoreq.0.41, 7.625.ltoreq..delta..ltoreq.9.15), and has a crystal structure in which a lamination unit of (Hg, Pb)O.sub.z -BaO-CuO.sub.2 -Ca-CuO.sub.2 -Ca-CuO.sub.2 -BaO is laminated in a c-axial direction of the crystal structure (0.625.ltoreq.z.ltoreq.2.15). Further, the method of manufacturing an oxide superconductor, according to the present invention, includes the steps of: mixing material powders of HgO, PbO, BaO, CaO and CuO at a mole ratio of (Hg.sub.1-x Pb.sub.x):Ba:Ca:Cu=a:2:b:c (1.ltoreq.a.ltoreq.2.5, 2.ltoreq.b.ltoreq.3, 2.5.ltoreq.c.ltoreq.4) and compression-molding the mixture powder into a compact; and subjecting the compact to a thermal treatment at 600.degree.-750.degree. C.Type: GrantFiled: September 12, 1994Date of Patent: August 22, 1995Assignees: Tohoku Electric Power Copany, Incorporated, Sumitomo Electric Industries, Ltd., Matsushita Electric Industrial Co., Ltd., International Superconductivity Technology CenterInventors: Kazuyuki Isawa, Ayako Yamamoto, Makoto Itoh, Seiji Adachi, Hisao Yamauchi
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Patent number: 5439878Abstract: A process for preparing a copper oxide superconductor of (Ba,Sr)-Cu-C-O containing carbonate radicals is disclosed, which comprises the steps of: mixing alkaline earth metal compounds and a copper compound with a molar ratio of 1.1 to 2.25 to obtain a mixture; pressing said mixture to form a pellet; and sintering said pellet in an oxygen atmosphere, wherein the alkaline earth metal compounds including a barium compound selected from the group consisting of barium carbonate and barium oxalate, and a strontium compound selected from the group consisting of strontium carbonate and strontium oxalate and the copper compound selected from the group consisting of copper carbonate, copper nitrate, copper oxalate and copper oxide.Type: GrantFiled: July 7, 1994Date of Patent: August 8, 1995Assignee: Nippon Telegraph and Telephone CorporationInventors: Kyoichi Kinoshita, Tomoaki Yamada
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Patent number: 5434125Abstract: A rare earth oxide superconducting material represented by REBa.sub.2 2Cu.sub.3 O.sub.y (RE is Y, Gd, Dy, Ito, Er or Yb), comprises oxide grains and at least one element selected from Rh and Pt, uniformly dispersed in the grain in a proportion of 0.01-5% by weight (in terms of element) based on the rare earth oxide superconducting material. The rare earth oxide superconducting material can be produced by a melt processing and gives a high critical current density even in a highly magnetic field.Type: GrantFiled: June 8, 1994Date of Patent: July 18, 1995Assignees: International Superconductivity Technology Center, NGK Insulators, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Naoyuki Ogawa, Takenobu Sakai, Izumi Hirabayashi
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Patent number: 5418214Abstract: A new copper oxide superconductor of the formula Ln.sub.1-x M.sub.x Sr.sub.2 Cu.sub.3-y Ti.sub.y O.sub.7+.delta. is disclosed, and exhibits a Tc of 60.degree. K. with deviations from linear metallic behavior as high as 130.degree. K.Type: GrantFiled: August 23, 1993Date of Patent: May 23, 1995Assignee: Northwestern UniversityInventors: Robert Toreki, Kenneth Poeppelmeier, Bogdan Dabrowski
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Patent number: 5413980Abstract: Polycrystalline high-T.sub.c superconductors of the formula M.sub.m E.sub.e RO.sub.x, which contain grains which are crystallographically aligned to the greatest possible extent, where M is at least one trivalent element such as a lanthanide element, E is at least one divalent element such as an alkaline earth element and R is at least one transition metal such as Cu, and x denotes the proportion of oxygen, are obtained by substituting a part of the alkaline earth element by a foreign element, preferably an alkali-metal element, which is no longer present in the product after the reaction sintering and sintering except for contents in the ppm to parts per thousand range and brings about the orientation effect. This produces a material which contains a slight deficit of E and optionally M, has an unaltered critical temperature and is substantially more resistant to external agents than equivalent known materials. A post-treatment in a stream of air or oxygen is unnecessary.Type: GrantFiled: August 23, 1990Date of Patent: May 9, 1995Assignee: Hoechst AktiengesellschaftInventors: Joachim Maier, Albrecht Rabenau, deceased, Pandijan Murugaraj
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Patent number: 5395820Abstract: An oxide superconductor comprising a crystal of LnBa.sub.2 Cu.sub.3 O.sub.y (wherein Ln is at least one of rare earth elements including Y) and, finely dispersed therein, Ln.sub.2 BaCuO.sub.5 and a composite oxide of PtBaCuO having an average particle diameter of 0.1 to 10 .mu.m is disclosed. The oxide superconductor is produced by melting a raw material powder comprising a composite oxide of Ln, Ba and Cu, rapidly solidifying the melt, pulverizing the resultant solid, mixing a Pt powder with the pulverized mixture, forming a resultant mixture, heating a resultant formed body to bring the formed body to a partially-molten state and cooling the partially-molten material.Type: GrantFiled: December 1, 1992Date of Patent: March 7, 1995Assignees: International Superconductivity Technology Center, Hokuriku Electric Power Company, Sumitomo Electric Industries, Ltd., Kawasaki Jukogyo Kabushiki Kaisha, Nippon Steel CorporationInventors: Masato Murakami, Tsutomu Takata, Koji Yamaguchi, Akihiro Kondoh, Naoki Koshizuka
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Patent number: 5389603Abstract: A new class of high temperature superconductive oxides is disclosed. An exemplary member of the class has nominal composition Pb.sub.2 Sr.sub.2 Y.sub.0.5 Ca.sub.0.5 Cu.sub.3 O.sub.8 and has a transition temperature T.sub.c (onset) of about 79K.Type: GrantFiled: February 9, 1990Date of Patent: February 14, 1995Assignee: AT&T Corp.Inventors: Bertram J. Batlogg, Robert J. Cava
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Patent number: 5382405Abstract: A method of manufacturing a shaped article from a powdered precursor, wherein the components of the powdered precursor are subjected to a self-propagating high-temperature synthesis (SHS) reaction and are consolidated essentially simultaneously. The shaped article requires essentially no machining after manufacture.Type: GrantFiled: September 3, 1993Date of Patent: January 17, 1995Assignee: Inland Steel CompanyInventors: Kenneth F. Lowrance, II, Eric C. Knorr, William M. Goldberger, Daniel Boss, Doreen Edwards
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Patent number: 5374611Abstract: A high temperature superconducting material with the general formula GaSr.sub.2 Ln.sub.1-x MxCu.sub.2 O.sub.7.+-.w wherein Ln is selected from the group consisting of La, Ce, Pt, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Y and M is selected from the group consisting of Ca and Sr, 0.2.ltoreq.x.ltoreq.0.4 and w is a small fraction of one. A method of preparing this high temperature superconducting material is provided which includes heating and cooling a mixture to produce a crystalline material which is subsequently fired, ground and annealed at high pressure and temperature in oxygen to establish superconductivity.Type: GrantFiled: October 1, 1992Date of Patent: December 20, 1994Assignees: The University of Chicago, Northwestern UniversityInventors: Bogdan Dabrowski, J. T. Vaughey, Kenneth R. Poeppelmeier
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Patent number: 5374610Abstract: An insulating composition consisting of Bi, Sr, RE, Cu, O or of Tl, Ba, RE, Cu, O (wherein; RE is an element selected from a group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) aligns properly with a crystal face of an oxide superconductor because its crystal structure is the same as or similar to that of the oxide superconductor. An insulating composition in which a part of Bi is replaced by Pb is further near the oxide superconductor its construction, and the modulation structure in this insulating composition is mitigated or disappears.Type: GrantFiled: May 8, 1991Date of Patent: December 20, 1994Assignee: Kabushiki Kaisha ToshibaInventors: Noburu Fukushima, Shunji Nomura, Hisashi Yoshino, Ken Ando, Hiromi Niu, Tomohisa Yamashita
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Patent number: 5372990Abstract: Provided is an oxide superconductor in which superconducting layer is sandwiched between two blocking layers having different compositions. Available superconducting layers include a one-layer system having one Cu-O.sub.2 sheet, a two-layer system having a mediating layer sandwiched between two Cu-O.sub.2 sheets, and a three-layer system having mediating layers sandwiched individually between three Cu-O.sub.2 sheets.Since the blocking layers are of different compositions, seventy-seven kinds of oxide superconductors can be obtained.Type: GrantFiled: May 20, 1992Date of Patent: December 13, 1994Assignee: Toray Industries, Ltd.Inventors: Hitoshi Nobumasa, Kazuharu Shimizu
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Patent number: 5360786Abstract: The disclosed superconductive material has a characteristic in accordance with which electrical resistance disappears at a temperature of at least more than the boiling point of 20.3.degree. K. (-252.7.degree. C.) of liquid hydrogen and relates to La-Ba-Cu-O series superconductive material.Said superconductive material consists essentially of a composition having the formula(La.sub.1-x M.sub.x).sub.2 CuO.sub.4-x/2wherein, M=Ba or Ba(Sr, Ca) and x=0.04.about.0.20 as a main body, wherein the material has a K.sub.2 NiF.sub.4 crystal structure.Type: GrantFiled: August 2, 1993Date of Patent: November 1, 1994Assignee: University of TokyoInventors: Shoji Tanaka, Koichi Kitazawa, Shin-ichi Uchida, Hidenoir Takagi
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Patent number: 5354733Abstract: An oxide superconductor contains carbonate radicals and compositions represented by the general formula (Ba.sub.1-x Sr.sub.x).sub.2 Cu.sub.1+y C.sub.w O.sub.3+Z, wherein x, y, w and z satisfy the following relations: 0.25.ltoreq.x.ltoreq.0.64, -0.11.ltoreq.y.ltoreq.0.77, 0.89.ltoreq.w.ltoreq.1.77 and 1.67.ltoreq.z.ltoreq.4.33. The superconductor has a transition temperature of 20 K. or higher and a coherence length of 30 .ANG..Type: GrantFiled: March 22, 1993Date of Patent: October 11, 1994Assignee: Nippon Telegraph and Telephone CorporationInventors: Kyoichi Kinoshita, Tomoaki Yamada
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Patent number: 5348934Abstract: A cathode for a secondary emission structure comprised of a superconductive material is described. In one embodiment the cathode comprises a layer of a superconductive material such as yttrium barium cupric oxide, or rare earth substituted neodymium cupric oxides. The layer may be bonded to a metal electrode or preferably the cathode consist of a superconductive or conductive oxide. The use of a superconductive material provides a cathode having suitable secondary emission characteristics and, furthermore, which being conductive at room temperatures, as well as, temperatures of operation of the cathode, obviating the need for a use of a very thin film of a secondary emission material.Type: GrantFiled: September 9, 1991Date of Patent: September 20, 1994Assignee: Raytheon CompanyInventor: Beverley A. Shaw
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Patent number: 5340794Abstract: The invention comprises a process of heat treatment to produce a high T.sub.c superconductor with increased flux pinning. A precursor compound is subjected to temperature and oxygen pressure conditions at which the precursor compound decomposes or converts partially or completely to the high T.sub.c superconductor and precipitated non-superconducting compounds which are dispersed through the structure of the high T.sub.c superconductor and which are effective to pin lines of magnetic flux. The precursor compound may or may not itself be a high T.sub.c superconductor. In the YBCO system, 2-4-7 may be converted to 1-2-3 or 1-2-3 to 2-4-7 and flux pinning copper oxides dispersed through the structure, for example, various other transformations are possible.Type: GrantFiled: March 18, 1992Date of Patent: August 23, 1994Assignee: Her Majesty the Queen in right of New ZealandInventors: Jeffery L. Tallon, Donald M. Pooke
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Patent number: 5332723Abstract: A method of producing a new high Tc superconducting material using fullerene molecules as artificial pinning sites for any magnetic flux that may enter the material.Type: GrantFiled: July 28, 1993Date of Patent: July 26, 1994Assignee: The United States of America as represented by the Secretary of the NavyInventors: Walter Eidelloth, deceased, James T. Busch, heir, Richard J. Gambino, Rodney Ruoff, Claudia D. Tesche
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Patent number: 5318949Abstract: A superconducting ceramic composition which is free of thallium, the composition having a unit cell containing two perovskite structure copper-oxygen planes and a rocksalt structure layer having a single plane containing cadmium.Type: GrantFiled: October 20, 1992Date of Patent: June 7, 1994Assignees: GEC-Marconi Limited, BICC Public Limited CompanyInventors: Martin R. Harrison, Simon R. Hall, Timothy P. Beales
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Patent number: 5318745Abstract: A method of manufacturing an oxide superconductor having a composition expressed by formula La.sub.2-X Sr.sub.X CaCu.sub.2 O.sub.6 (0<X.ltoreq.0.6), comprising the steps of: preliminarily burning a raw powder having a predetermined composition, and sintering the powder to obtain a sintered body; and subjecting the sintered body to hot isostatic pressing at a temperature falling within a range of from 940.degree.-1600.degree. C. under total pressure of 10 MPa or more and oxygen partial pressure of 2 MPa or more. By virtue of the step of subjecting the sintered body to hot isostatic pressing, a superconductor can be manufactured at a temperature and under a pressure within respective wide ranges. Further, the composition of the superconductor can be selected within a wide range of 0<X.ltoreq.0.6. Moreover, the superconductor can be manufactured by performing quenching after the hot isostatic pressing.Type: GrantFiled: July 8, 1992Date of Patent: June 7, 1994Assignees: International Superconductivity Technology Center, Mitsubishi Materials Corporation, Hitachi, Ltd.Inventors: Takeshi Sakurai, Toru Yamashita, Hisao Yamauchi, Shoji Tanaka