Electrical, mechanical, computing, and/or other devices that include components formed of extremely low resistance (ELR) materials, including, but not limited to, modified ELR materials, layered ELR materials, and new ELR materials, are described.

Electrical, mechanical, computing, and/or other devices formed of extremely low resistance materials

In order to prevent inflation of a metallic coating during heat treatment so that no ununiformity is caused in the critical current density in a method of preparing an oxide superconducting wire which is obtained by heat treating and sintering metal-coated raw material powder for an oxide superconductor, raw material powder (5) for an oxide superconductor is filled up in a metal billet (1), which in turn is degassed and sealed in the degassed state, elongated with application of hydrostatic extrusion, and then heat treated.

Method of preparing oxide superconducting wire

Method of manufacture of a composite wiring structure for use with at least one semiconductor device, the structure having a first conductive member upon which the semiconductor device can be mounted for electrical connection thereto. A dielectric member, made of ceramic or organo-ceramic composite material, is bonded to the first conductive member and contains embedded therein a conductive network and a thermal distribution network. A second conductive member may be incorporated with the composite wiring structure, with a capacitor electrically connected between the conductive network and the second conductive member. Bonding between the dielectric member and the conductive members may be in the form of a direct covalent bond formed at a temperature insufficient to adversely effect the structural integrity of the conductive network and the thermal distribution network.

Method of manufacture of ceramic composite wiring structures for semiconductor devices

The invention provides methods to manufacture dense, complex c-axis oriented ceramic oxide layers with thickness greater than 2.5 microns (μm) on a metallic substrate (composites) without the use of an interfacial barrier, buffer, or surface layer using a metalorganic deposition process and thermomechanical reaction treatments is disclosed. A porous amorphous metal oxide ceramic deposit is formed directly on the substrate by spray pyrolyzing a mixed metalorganic precursor solution onto the metallic substrate. The metallic substrate has been previously heated to temperatures greater than the boiling point of the organic solvent and are high enough to initiate in situ decomposition of the metalorganic precursor salts. The process does not apply the precursor solution to the substrate as a liquid coating that is pyrolyzed in subsequent processing steps. The resultant porous amorphous oxide deposit is processed into a dense amorphous ceramic, or a fully crystallized c-axis oriented ceramic through a series of mechanical compression and short reaction treatments that are used to crystallize the amorphous ceramic layer. The inventive method applies to making complex ceramic oxides including superconducting compositions of bismuth cuprate ceramic, piezoelectric or insulating compositions. The composites so produced are useful in devices that include ceramic sputtering targets, heat shields, electrically conducting wires, magnetic solenoids, electromagnetic shielding, and energy storage devices. The invention also provides the ceramic-metal composites so made.

Method for making ceramic-metal composites and the resulting composites

An oxide superconductor having oxide superconductor layers (2) and metal material layers (1), which are alternately laminated on each other by a desired number of times, wherein the metal material layers (1) are continuous in a longitudinal direction of the superconductor and are discontinuous in a circumferential direction of the superconductor.

Oxide superconductor and method of manufacturing the same

We have developed a relatively large high-Tc Bi-Pb-Sr-Ca-Cu-O superconducting magnetic shield vessel of 150 mm in inner diameter, 320 mm in depth and 10 mm in thickness, which has a potential application for biomagnetic measurements with a SQUID. Magnetic fields inside the vessel were measured by using an RF SQUID magnetometer or measuring induced voltages in a pickup coil. The shielding factors, defined as the ratio of the magnetic field at 290 K to that at 77 K, were around 106. The high attenuation ratio indicates that magnetic shielding of high-Tc superconductor is promising for neuromagnetic measurements with SQUIDs.

Large vessels of high-Tc Bi-Pb-Sr-Ca-Cu-O superconductor for magnetic shield

Magnetic shielding effects of superconducting Y-Ba-Cu-O vessels have been studied. Magnetic fields inside a Y-Ba-Cu-O vessel in a superconducting state at 77 K were compared with those in a normal state at 290 K by measuring induced voltages in a pick-up coil inside the vessel. The ratio of the magnetic field at 77 K to that at 290 K was as good as 2×10-6 when a magnetic field of 0.03 mT at 1000 Hz was applied to the outside of the vessel. This attenuation ratio is good enough for neuromagnetic measurements with a SQUID magnetometer.

Magnetic Shield of High- T c Oxide Superconductors at 77 K

A method for making superconductive ceramics laminates comprises forming a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a substrate, and orienting and crystallizing the thus formed film by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate. An intermediate layer formed of a noble metal, MgO, SrTiO3, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element may be interposed between the film and the substrate.

Method for production of bi-containing superconducting ceramics laminates

A method for making superconductive ceramics laminates comprises forming a thick film (2) of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a substrate (1), and orienting and crystallizing the thus formed film by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate. An intermediate layer formed of a noble metal, MgO, SrTiO₃, yttria-stabilized zirconia or an oxide of a superconductive ceramics-­constituting element may be interposed between the film and the substrate.

Superconductive ceramics laminates and method for production thereof

PURPOSE: To easily improve the critical current density of a Bi-Sr-Ca-Cu compound oxide formed on a metallic substrate, by heat-treating thick film of the compound oxide to effect the orientation of the crystal axis in a specific manner. CONSTITUTION: A thick film of a compound oxide composed of Bi, Sr, Ca and Cu is formed on a flat surface of a metallic substrate such as a tape. The thick film is heat-treated to crystallize the oxide in a state to orient the c-axis of the crystal essentially perpendicular to the surface of the substrate. The substrate is preferably silver, copper, gold, platinum or nickel. The heat- treatment of the film is preferably carried out by heating the film at 860W900°C to melt a part or total of the film and slowly cooling the molten film. COPYRIGHT: (C)1989,JPO&Japio

Shigeru Yamazaki

Papers

Large vessels of high-Tc Bi-Pb-Sr-Ca-Cu-O superconductor for magnetic shield

Magnetic Shield of High- T c Oxide Superconductors at 77 K

Method for production of bi-containing superconducting ceramics laminates

Superconductive ceramics laminates and method for production thereof

Laminate of superconducting ceramics and production thereof