Abstract: A method for producing a superconducting article. An alloy consisting of metal elements, such as Y, Ba and Cu which are constituent elements of a superconducting compound oxide to be produced is oxidized so that a surface of the alloy is converted to the superconducting compound oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-.delta..

Abstract: A metal electrode formed on an oxide superconductor for electric connection to the oxide superconductor, includes a first layer of Ag in direct contact with the oxide superconductor, and a second layer formed on the first layer. The second layer is formed of noble metal excluding Ag.The metal electrode can be formed by forming a first layer of Ag to cover a whole surface of the oxide superconductor layer, and forming a second layer of noble metal excluding Ag, to cover a whole surface of the first layer, thereby to form a double metal layer, and patterning the double metal layer so as to form a metal electrode composed of the double metal layer.

Abstract: In a process for preparing a thin film of oxide superconductor having a layered crystal structure by depositing each layer of said layered crystal structure on a substrate by Molecular Beam Epitaxy (MBE) method with introducing oxygen-containing gas which is exited by irradiation of microwave, improvement in that a film-forming operation by the MBE method is interrupted temporally after predetermined numbers of constituent layers which correspond to one unit crystal or less than one unit crystal are layered so that the deposited constituent layers are left in an activated oxygen atmosphere to effect a crystallization promotive operation, before next film-forming operation is restarted.

Abstract: A method of preparing a high Tc superconducting fiber is disclosed, which comprises drawing into fiber form a core filament of a crystalline oxide, continuously depositing on the heated core filament a high Tc superconducting thin film and then depositing a protective layer on the outer surface of the high Tc superconducting thin film.

Abstract: A superconducting composite comprising a compound oxide type superconductor and an outer metal pipe on which said superconductor is supported, characterized in that (i) said outer metal pipe is made of at least one of metals selected from a group comprising gold, silver and platinum metals and their alloys or (ii) an intermidiate layer made of these precious metals is interposed between the compound oxide and the metal pipe.The composite may be in a form of a solid pipe or a hollow pipe having a superconducting thin layer deposited on an inner surface of the metal pipe.

Abstract: Improvement in a superconducting thin film of a superconducting compound oxide containing thallium (Tl) deposited on a substrate, characterized in that the superconducting thin film is deposited by PVD on {110} plane of a single crystal of magnesium oxide (MgO).

Abstract: A superconducting material and a process for producing a superconducting material comprising a compound oxide represented by the general formula:(Ba, .gamma.).sub.x (.alpha.,.beta.).sub.1 -.sub.x .epsilon..sub.y Cu.sub.1-y O.sub.3-zin which".gamma." represents an element of the IIa group of the periodic table except Ba, and atomic ratio of .gamma. to Ba, being selected in a range between 1% and 90%,".alpha." represents Y or La,".beta." represents an element of the IIIa group of the periodic table but is different from .alpha., an atomic ratio of .beta. to .alpha. being selected in a range between 1 and 90%,".epsilon." represents a metal element of the IIIb group of the periodic table, x, y and z are numbers each satisfies ranges of 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and 0.ltoreq.z.ltoreq.1 respectively, andthe expression of (Ba, .gamma.) and (.alpha.,.beta.) mean that the respective elements occupy predetermined sites in a crystal in a predetermined proportion.

Abstract: A superconducting material and a process for producing a superconducting material comprising a compound oxide represented by the general formula:(Ba, .gamma.).sub.x (.alpha.,.beta.).sub.1-x .epsilon..sub.y Cu.sub.1-y O.sub.3-zin which".gamma." represents an element of the IIa group of the periodic table except Ba, an atomic ratio of .gamma. to Ba, being selected in a range between 1% and 90%,".alpha." represents Y or La,".beta." represents an element of the IIIa group of the periodic table but is different from .alpha., and atomic ratio of .beta. to .alpha. being selected in a range between 1 and 90%,".epsilon." represents a metal element of the IIIb group of the periodic table, x, y and z are numbers each satisfies ranges of 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and 0.ltoreq.z.ltoreq.1 respectively, andthe expression of (Ba, .gamma.) and (.alpha., .beta.) mean that the respective elements occupy predetermined sites in a crystal in a predetermined proportion.

Abstract: A process for producing a superconducting thick film including steps comprising subjecting a powder mixture of oxides or carbonates of Ba, Y and Cu each having an average particle size of less than 5 .mu.m to preliminary sintering, pulverizing the preliminary sintered mass into a powder having an average particle size of less than 10 .mu.m, and then admixing the pulverized powder with an organic vehicle to prepare a paste which is applied on a substrate and is sintered finally. The preliminary sintering is carried out at a temperature ranging from 700.degree. to 950.degree. C., while the final sintering is carried out at a temperature ranging from 800.degree. C. to 1,000.degree. C.

Abstract: A process for preparing a superconducting thin film of a compound oxide by a process which is similar to MBE technique. In the present process, a plurality of atom beams or molecular beams each contains one element selected from constituent elements of the compound oxide are directed onto a substrate in a predetermined order, so that a plurality of mono-molecular layers are deposited on the substrate.

Abstract: A superconducting fiber comprising a core filament composed of an oxide such as MgO and a superconducting thin film layer composed of superconducting compound oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-.delta. and deposited continuously on an outer surface of said core filament.

Abstract: A now superconducting material comprising a compound oxide represented by the general formula:(Sr,.gamma.).sub.x (La,.delta.).sub.1-x .epsilon..sub.y Cu.sub.1-y O.sub.3-zin which".gamma." represents an element of IIa group of the periodic table except Sr, an atomic ratio of .gamma. to Sr being selected in a range between 1% and 90%,".delta." represents an element of IIIa group of the periodic except La, an atomic ratio of .delta. to La is selected in a range between 1% and 90%,".epsilon." represents a metal element of Vb group of the periodic table, x, y and z are numbers each satisfies ranges of 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and 0.ltoreq.z<1 respectively, andthe expression of (Sr,.gamma.) and (La,.delta.) mean that the respective elements position predetermined sites in a crystal in a predetermined proportion.

Abstract: In a process for depositing a superconducting thin film of bismuth-containing compound oxide on a substrate by physical vapor deposition, the improvement wherein the substrate is heated at a temperature between 670.degree. and 750.degree. C. during the deposition.

Abstract: Improvement in a method for producing superconductors of thallium (T1) type compound oxides by sintering a material powder mixture including at least one thallium-containing powder, the method including wrapping the material powder mixture in a foil of precious metals or their alloys and placing the wrapped material powder in a pipe of precious metals or their alloys and having an opening, wherein the material powder mixture wrapped in the foil is sintered in the pipe while oxygen gas is supplied into the pipe through the opening.

Abstract: Improvement in a method for producing a sintered elongated article by the steps comprising filling a metal pipe with a material powder, carrying out plastic deformation of the metal pipe and then subjecting the material powder in deformed metal pipe to sintering. In the invention, a netting of metallic wire (1) whose melting point is higher than a melting point of the material powder (3) is arranged around the metal pipe (2) before the sintering.

Abstract: Improvement in a superconducting thin film of compound oxide represented by the formula: LnBa.sub.2 Cu.sub.3 O.sub.7- .delta. (Ln is lanthanide) or (La.sub.1-x .alpha..sub.x).sub.2 CuO.sub.4 (.alpha. is Ba or Sr) deposited on a substrate or core made of MgO, SrTiO.sub.3 or ZrO.sub.2 by physical vapor deposition technique, the surface roughness R.sub.max (datum length=1,000 .mu.m) of the superconducting thin film being less than 0.2 .mu.m.

Abstract: The invention is an aftertreatment of a high Tc compound oxide type superconducting material by oxygen plasma to improve the superconducting property of the material. The treatment oxygen plasma is preferably performed while the material is heated at 400.degree. to 1,050.degree. C.The material may have a form of bulky mass or a thin film deposited on a substrate by physical vapour deposition technique.

Abstract: Improvement in a superconducting thin film of a superconducting compound oxide containing thallium (T1) deposited on a substrate, characterized in that the superconducting thin film is deposited on {110} plane of a single crystal of magnesium oxide (MgO).

Abstract: Improvement in a superconducting thin film of a superconducting compound oxide containing bismuth (Bi) deposited on a substrate, characterized in that the superconducting thin film is deposited on {110} plane of a single crystal of magnesium oxide (MgO).

Abstract: In a superconducting thin film composed of compound oxide containing at least one of element selected from a group comprising Y, La, Gd, Ho, Er, Tm, Yb, Dy, Sm, Eu and Lu, Ba and Cu, improvement in that said thin film consists of a single crystal or polycrystal whose c-axis is orientated to a predetermined direction or mono-directionally.