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Bismuth strontium calcium copper oxide
Additional recommended knowledge
Specific types of BSCCO are usually referred to using the sequence of the numbers of the metallic ions. Thus BSCCO-2212 (Bi2Sr2Ca1Cu2O8) has a critical temperature of 95 K and BSCCO-2223 (Bi2Sr2Ca2Cu3O10) has Tc = 107 K. Both these critical temperatures are above the temperature of liquid nitrogen. BSCCO was also the first high-temperature superconductor to be discovered which did not contain a rare earth element.
BSCCO-2212 is the first high-temperature superconductor to be used for making conducting wires. Although it has the same problems with weak links at crystal grain boundaries as YBCO, for BSCCO this can be overcome by a texture evolution during the rolling process due to Van-der-Waals coupled BiO layers, which are not present in YBCO. However, its critical current density (Minimal Amps per square Metre of cross-sectional area) in magnetic fields at elevated temperatures is about a factor 10 less than that of YBCO.
Both BSCCO-2212 and BSCCO-2223 can be made into wires via the Powder in Tube process, though BSCCO-2223 then has to be rolled into a tape to align the crystals sufficiently to form a useful superconductor.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bismuth_strontium_calcium_copper_oxide". A list of authors is available in Wikipedia.|