Bismuth-strontium-calcium-copper oxide
BSCCO (also BiSCCO ) is an acronym for bismuth - strontium - calcium - copper oxide (English - copperoxide ). This involves several high-temperature superconductors , since they are of the homologous series Bi 2 Sr 2 Ca n Cu n +1 O 2 n +6 , the members of which differ essentially in the number of CuO levels in the unit cell.
properties
BSCCO is a ceramic-like material, but with metallic properties, which has given new impetus to work on superconductivity worldwide, as it is already superconducting at temperatures above the boiling point of liquid nitrogen (77 K). Liquid nitrogen is around 10–20 times cheaper than liquid helium , requires less effort for the insulating vessels and is available worldwide.
application
Technically interesting are Bi2212 (Bi 2 Sr 2 CaCu 2 O 8 ) with a transition temperature of up to 92 K and Bi2223 (Bi 2 Sr 2 Ca 2 Cu 3 O 10 ) with 110 K. They become the first generation of strip conductors after the PIT process ( Powder In Tube ) manufactured. Here, BSCCO powder is filled into silver tubes and these are then rolled out into thin strips with many filaments . Because of the high material costs (silver) and because the current-carrying capacities in the magnetic field of some Tesla are insufficient, research is currently being carried out around the world on the second generation of YBCO strip conductors .
literature
- F. Schwaigerer, B. Sailer, J. Glaser, HJ Meyer: Electricity served ice cold: superconductivity . In: Chemistry in Our Time . No. 36 , 2002, p. 108-124 , doi : 10.1002 / 1521-3781 (200204) 36: 2% 3C108 :: AID-CIUZ108% 3E3.0.CO; 2-Y .