Abstract: Improved magnesium diboride superconducting materials and methods of synthesis are disclosed. Embodiments of the superconducting material comprise at least two starting materials capable of forming MgB2 and at least one dopant compound comprising silicon, carbon, hydrogen and oxygen. The starting materials and the at least one dopant compound are heated and mixed at an atomic level to produce a silicon-doped MgB2 superconducting material. Examples of the dopant compound include silicone oil, Triacetoxy(methyl)silane (2), 1,7-Dichloro-octamethyltetrasiloxane (2) and Tetramethyl orthosilicate (6).
Type:
Application
Filed:
July 23, 2007
Publication date:
May 12, 2011
Applicant:
University of Wollongong
Inventors:
Xiaolin Wang, Shi Xue Dou, Md. Shahriar Al Hossain, Zhenxiang Cheng
Abstract: 100-800 nm ReBCO films with critical current density (Jc) values in excess of 1 MA/cm2 were fabricated from aqueous nitrate precursor solutions with additives. Additives such as polyethylene glycol (PEG) and sucrose were selected to suppress crystallization of barium nitrate. This produces higher concentration solutions resulting in thicker crack-free single layers. Additional water-soluble viscosity modifiers, such as polyvinyl alcohol (PVA) or cellulose-derivatives, were used to increase thickness and allow wetting of ceramic surfaces. Water vapor present at higher temperatures during heat-treatment damaged the films, while the role of water vapor at lower temperatures is still under investigation.
Type:
Application
Filed:
June 29, 2007
Publication date:
April 15, 2010
Applicant:
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventors:
Michael J. Cima, Masateru Yoshizumi, Daniel E. Wesolowski, Yoda R. Patta
Abstract: For provides a superconducting material comprising highly chemically stable Fullerene carbon molecules having a relatively high transition temperature and high chemical stability, C20 Fullerene molecules having stronger electron-lattice interaction than that of C60 Fullerene molecules are used, in order to polymerize the C20 Fullerene molecules into a one-dimensional chain, C20 is incorporated in a gap of a material having a large band gap between a valence band and a conduction band, thereafter, electrons or positive holes are injected into the obtained C20 Fullerene chain polymer via an electric field application for phase transition to a superconductor.
Abstract: The invention provides superior reaction products of copper, especially ultra-clean copper and polymeric chemical complexes. The polymers are unusual in that they provide polymeric systems of extensive conjugated double bond networks well suited for electron flow. The polymers are the covalent reaction products of aroylacrylates and isocyanates or thioisocyanates and are of stability and ease of manufacture.The materials provide superior electrical conductors and superconductors. Through the use of lattice modifiers and stabilizers the lattices of the polymers may be "fine tuned" easily so as to optimize important characteristics such as electron flow.The organic coatings on the copper perform best as thin films, especially as films thinner than lambda, the penetration depth of the magnetic flux into the superconductor. The long term widely accepted use of copper as an electrical conductor, with its flexibility, durability, and strength is preserved while its electrical current capacity is greatly enhanced.
Abstract: Circuit board devices are provided based on use of high temperature superconducting ceramic polymers comprising high temperature superconducting ceramic powders distributed in electrically insulative organic polymers which are thermosetting by reaction of a two-part liquid mixture or by catalytic or photoinitiation of a one-part liquid. The ceramic domains transmit their superconductivity across the insulating barriers of organic polymers enabling formation of superconductive lines and superconducting bonds to electronic devices to be adhered to circuit boards, and providing superconducting circuitry.
Abstract: A composite includes granules of Type II superconducting material and granules of rare-earth permanent magnets that are distributed in a binder. The composite is a two-phase structure that combines the properties of the superconductor and magnets with the flexibility and toughness of a polymeric material. A bearing made from this composite has the load capacity and stiffness of a permanent magnet bearing with added stability from a Type II superconducting material.