Abstract: A process for preparing a superconducting thin film composed of compound oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-.delta. deposited on a substrate such as SrTiO.sub.3. Improvement is in that a heat-treatment of the deposited thin film is carried out in a same chamber in which the thin film of compound oxide is deposited on the substrate without taking the substrate out of said chamber.

Abstract: A superconducting Yb.sub.1 Ba.sub.2 Cu.sub.4 O.sub.z thin film is formed by a metalorganic deposition method which comprises depositing a solution comprising neodecanoates of Yb, Ba and Cu and a solvent having at least approximately 10 volume percent pyridine in xylene onto a substrate selected from the group consisting of strontium titanate, barium titante, and sapphire; pyrolyzing the coated substrate to thermally decompose the neodecanoates at a temperature of about 500.degree. C. followed by a rapid thermal annealing.

Abstract: A method for producing a metal-oxidic superconductor material with a high transition temperature and an increased critical current density. The method comprises applying a layer of a metal-oxidic preliminary product comprising the components of the metal-oxidic material, with a crystal structure still having faults, to a substrate, and subsequently, forming the desired superconducting metal-oxide phase by means of a heat and oxygen treatment, where a critical current density of the layer is greater parallel to the surface of the layer than in the direction of the normal of the layer, and wherein the preliminary product is moved through a heated zone parallel to the surface of the layer at a predetermined velocity, wherein the zone has a positive maximum temperature gradient (.DELTA.T/.DELTA.x) measured in the direction of motion, of at least 5 K/mm and preferably of at least 10 to 50 K/mm.

Abstract: The present invention pertains to a method of preparing particles of superconducting ceramic powders, which method comprises:(a) dissolving the soluble salts of the cations in aqueous medium;(b) obtaining a solution having pH of between about 4 and 7 by optionally treating the aqueous medium with ammonia, or ammonium hydroxide;(c) atomizing the solution of step (b) onto liquid nitrogen at about -196.degree. C.;(d) removing the liquid nitrogen by evaporation;(e) removing the water by sublimation at reduced pressure;(f) heating the solid residue of step (e) at 40-60.degree. C. at reduced pressure;(g) calcining the solid residue in flowing oxygen or air at temperature of between about 200.degree. to 895.degree. C.; and(h) cooling the solid at a temperature of between about 900.degree. C. and ambient temperature in sufficient air or oxygen and recovering the superconducting powder having an average diameter of between about 0.1 and 10 microns.

Abstract: A superconducting ceramic wire is prepared from a superconducting ceramic-forming oxide composition by melting, the composition and quenching the melt to form a dense glass, which is soften and wire-drawn in a furnace. The resulting wire is heat-treated to form crystals and made into a superconducting ceramic wire. The wire has a flexibility and remarkable superconductivity which can further be improved by applying pressure to be made more dense and repeating the heat-treatment.

Abstract: There is disxlosed a process for preparing a novel superconducting material. This material has the formula YBa.sub.2 Cu.sub.3 O.sub.7-x wherin x is equal to or less than 0.3, the material has a bulk density of from about 90 to about 96 percent, and the hardness of the material is in excess of 5.0 GigaPascals.In the first step of the process, there is provided a pure powder comprised of barium, yttrium, and copper in a mole ratio of 2/1/3. Such powder is comprised of less than 1.0 mole percent of impurity.In the second step of the process, the powder is compacted. Thereafter, the compacted powder is fired at a temperature of from about 1,000 to about 1,300 degrees Clesius for a period not exceeding 12 hours.In the third step of the process, the temperature of the fired powder is reduced at least 20 degrees Celsius to a first reduced temperature within the range of from about 960 to about 990 degrees Celsius, and the powder is than held within this reduced temperature range for at least 1 hour.

Abstract: A superconducting Y.sub.1 Ba.sub.2 Cu.sub.4 O.sub.2 thin film is formed by a metalorganic deposition method which comprises depositing a solution comprising neodecanoates of Y, Ba and Cu and a solvent having at least approximately 5 volume percent pyridine in xylene onto a substrate selected from the group consisting of strontium titanate, barium titanate, and sapphire; pyrolyzing the coated substrate to thermally decompose the neodecanoates at a temperature of about 500.degree. C. followed by a rapid thermal annealing.

Abstract: Discloses a process for producing oxidic superconductors having advantageously textured oxide structures which involves zone oxidizing elongated metallic precursors of the superconductors.

Abstract: A method is shown of applying in accordance with a pattern thin layers of an oxidic superconductive material onto a substrate in which a copper oxidic based material that after heating is rendered superconducting at a desired service temperature is covered in a desired pattern with a composition that renders the underlying oxidic material non-superconducting.

Abstract: A superconducting ceramic film is deposited on a substrate sputtering. In virtue of the low thermal conductivity of ceramic, a laser beam is radiated to the ceramic film in order to remove the irradiated portion by sublimation and produce a pattern on the ceramic film.

Abstract: A superconductor material having a current density, J, of from about 30,000 to about 85,000 amps/cm.sup.2 at zero magnetic field and 77.degree. K. is disclosed. The 123 superconductor is of the formula L.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. wherein L is preferably yttrium. The process comprises compacting the solid state reaction product of L.sub.1 Ba.sub.2 Cu.sub.3 O and then sintering the reaction product at a temperature between about 40.degree. C. to about 90.degree. C. below its melting point, i.e., for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. at a temperature of approximately 940.degree. C. The composition is then heated in a preheated chamber maintained at approximately 1090.degree. C. to about 1,200.degree. C. (approximately 1,100.degree. C. for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta.) until it has been decomposed, and is then rapidly cooled to a temperature between about 10.degree. C. to about 30.degree. C. above its melting point, i.e. for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta.

Abstract: This invention is directed to a method of preparing a superconducting metal oxide film on a substrate. More particularly, the method comprises depositing a superconducting metal oxide precursor film on the substrate and then subjecting it to annealing in an oxygen nitrogen atmosphere followed by annealing in an oxygen atmosphere, followed by rapid cooling, according to schedule wherein the time and temperature are critically defined.

Abstract: In a process for making the superconductive composition YBa.sub.2 Cu.sub.3 O.sub.x, cupric carbonate or cupric oxalate is used as the copper source and barium carbonate as the barium source to achieve higher densification.

Abstract: A superconducting oxide film is prepared by a method of seeding formation and heat treatment which comprises depositing a layer of a metal-oxide precursor on a predetermined substrate, forming a seed of a predetermined superconducting phase only in a locally limited region of the metal-oxide precursor at a boundary surface to the substrate by means of a solid-state reaction triggered by pulsed energy radiation, and then at least partially converting the metal-oxide precursor into the desired superconducting metal-oxide phase by a heat treatment in the oxygen atmosphere at a temperature below 800.degree. C.

Abstract: With the method a layer-like composition of an oxide-ceramic superconducting material with a high transition temperature and great current carrying capacity on the basis of a materials system containing metallic components and oxygen can be prepared. The method is to be improved in the direction that layers with great current-carrying capacity can be formed also on non-monocrystalline substrates. It is provided for this purpose that a multi-layer layer of the superconductive material is applied on a fine-crystalline substrate by first making successive layers of individual films with a respective film thickness under 10 nm, and then this multilayer structure is converted into the desired superconducting phase by means of supplying oxygen and at a temperature below 400.degree. C. For developing each individual film, the metallic components of the system are applied to the substrate that may be available, by means of a physical deposition process and while oxygen is being supplied, at a temperature below 400.

Abstract: The invention is an after-treatment of a compound oxide type superconducting material by oxygen plasma to improve the superconducting property of the material. The treatment by oxygen plasma is performed while the material is heated at 500.degree. to 1,000.degree. C.The material may have a form of bulky mass or a form of a thin film deposited on a substrate by physical vapor deposition technique.