Title :
Microstructure and critical currents in AgMg-sheathed multifilamentary Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ tapes
Author :
Hu, Q.Y. ; Sastry, P.V.P.S.S. ; Trociewitz, U.P. ; Schwartz, J.
Author_Institution :
Nat. High Magnetic Field Lab., Tallahassee, FL, USA
fDate :
6/1/1999 12:00:00 AM
Abstract :
For the Ag-sheathed Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ tapes, the high Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ phase purity with an appropriate oxygen concentration and excellent grain alignment are responsible for high critical currents. Many fabrication parameters influence the Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ phase content and microstructure of the tapes, which have been investigated by many researchers. In this paper, we present results of AgMg-sheathed Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ heat treatment optimization and characterization. With the help of physical analytical methods such as ESEM, and XRD, the melt temperature is related to the transport measurements.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; magnesium alloys; silver alloys; strontium compounds; superconducting tapes; AgMg-sheathed multifilamentary Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ tapes; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/-AgMg; critical currents; grain alignment; high critical currents; high temperature superconductor; microstructure; Bismuth; Conductors; Critical current; Electrons; Etching; Fabrication; Magnetic fields; Microstructure; Strontium; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
