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Yttrium barium copper oxide (YBCO) is a family of crystalline chemical compounds that display high-temperature superconductivity; it includes the first material ever discovered to become superconducting above the boiling point of liquid nitrogen [77 K (−196.2 °C; −321.1 °F)] at about 93 K (−180.2 °C; −292.3 °F).
Critical temperature T c, the temperature below which the wire becomes a superconductor; Critical current density J c, the maximum current a superconducting wire can carry per unit cross-sectional area (see images below for examples with 20 kA/cm 2). Superconducting wires/tapes/cables usually consist of two key features:
YBCO: Cuprate 95 120–250 II no EuBCO Cuprate 93 II no [46] GdBCO Cuprate 91 II no [47] BSCCO: Cuprate 104 HBCCO Cuprate 135 HgTlBaCaCuO Cuprate 164 II [citation needed] SmFeAs(O,F) Iron-based 55 CeFeAs(O,F) Iron-based 41 LaFeAs(O,F) Iron-based 26 LaFeSiH Iron-based 11 [48] LaFePO Iron-based 4 FeSe:SrTiO 3: Iron-based 60-100 (Ba,K)Fe2As2 Iron ...
The most famous ReBCO is yttrium barium copper oxide, YBa 2 Cu 3 O 7−x (or Y123), the first superconductor found with a critical temperature above the boiling point of liquid nitrogen. [10] Its molar ratio is 1 to 2 to 3 for yttrium, barium, and copper and it has a unit cell consisting of subunits, which is the typical structure of perovskites .
The Holbrook Superconductor Project is the world's first production superconducting transmission power cable. [1] The lines were commissioned in 2008. [2] The suburban Long Island electrical substation is fed by a 600 meter long tunnel containing approximately 155,000 meters of high-temperature superconductor wire manufactured by American Superconductor, installed underground and chilled to ...
Strong superconducting electromagnets (used in MRI scanners, NMR machines, and particle accelerators) often use coils wound of niobium-titanium wires or, for higher fields, niobium-tin wires. These materials are type-II superconductors with substantial upper critical field H c2 , and in contrast to, for example, the cuprate superconductors with ...
U.S. President Donald Trump's new homeland security secretary made sure cameras were rolling when she joined federal agents to arrest migrants in New York City, including a Venezuelan man wanted ...
For example, YBCO and BSCCO can alternatively be referred to as Y123 and Bi2201/Bi2212/Bi2223 depending on the number of layers in each superconducting block (n). The superconducting transition temperature has been found to peak at an optimal doping value ( p =0.16) and an optimal number of layers in each superconducting block, typically n =3.