Title :
Effect of Pb-, La- and Ti-substitutions on the microstructure and superconducting properties of Bi-2212/Ag composite tapes
Author :
Fujii, H. ; Kumakura, H. ; Togano, K.
Author_Institution :
Nat. Res. Inst. for Metals, Tsukuba, (Japan). 1st Res. Group, 1G
fDate :
3/1/2001 12:00:00 AM
Abstract :
We investigated the effect of Pb-, La- and Ti-substitutions on the microstructure and superconducting properties of Bi-2212/Ag composite tapes. Ti-substituted tapes were more poorly aligned than Pb- and La-substituted tapes. Transition temperature (Tc) could be achieved above 80 K by Pb- and La-substitutions, while Tc decreased below 80 K by Ti-substitution. Transport critical current density (Jc) values were below 10 kA/cm2 for the Pb- and Ti-substituted tapes, while the La-substituted tapes showed highest Jc values of 150 kA/cm2. The magnetically determined irreversibility field (Birr) was not improved by substitution. This was independent of elements substituting
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; lanthanum compounds; lead compounds; silver; strontium compounds; superconducting tapes; superconducting transition temperature; titanium compounds; 80 K; Bi-2212/Ag composite tapes; Bi2PbLaTiSr2CaCu2O8 -Ag; Jc; La-substitution; Pb-substitution; Tc; Ti-substitution; magnetically determined irreversibility field; microstructure; superconducting properties; transition temperature; transport critical current density; Anisotropic magnetoresistance; Bismuth; Heat treatment; Magnetic fields; Microstructure; Superconducting films; Superconducting transition temperature; Superconductivity; Temperature distribution; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
