Title :
Compositional and microstructural analysis of high Ic and Jc Bi-2212 conductors
Author :
Holesinger, Terry G. ; Kennison, John A. ; Marken, Kenneth R. ; Miao, Hanping ; Meinesz, Martin ; Campbell, Scott
Author_Institution :
Los Alamos Nat. Lab., NM, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
Compositional analysis of the Bi2Sr2CaCu2Oy (Bi-2212) and secondary phases in high-current Bi-2212 conductors was performed. The composition of the Bi-2212 phase in dip-coated Bi-2212 tapes tended toward the Sr-rich end of the Bi-2212 solid solution. The strontium and calcium contents of the Bi-2212 phase in round wire tended to lie closer to the starting composition of the powder. In all cases, there was an excess of bismuth and a deficiency of the alkaline earths with respect to the ideal 2212 stoichiometry. Microstructural analysis by transmission electron microscopy has shown the presence of Bi-2201 intergrowths within Bi-2212 grains and amorphous layers within the colonies of Bi-2212.
Keywords :
bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; solid solutions; stoichiometry; strontium compounds; superconducting tapes; transmission electron microscopy; Bi-2201 intergrowths; Bi-2212 grains; Bi-2212 solid solution; Bi2Sr2CaCu2O8; alkaline earths; amorphous layers; calcium content; compositional analysis; high current Bi-2212 conductors; microstructural analysis; powder; round wire; strontium content; transmission electron microscopy; Bismuth; Calcium; Conductors; Earth; Electrons; Performance analysis; Powders; Solids; Strontium; Wire; Bismuth compounds; composition; high temperature superconductivity; microscopy;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.847652
