Title :
Properties of freeze-dried Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/: effects of Ag doping and analysis of powder-in-tube tapes
Author :
Deis, T.A. ; Eror, N.G. ; Lelovic, M. ; Prorok, B.C. ; Balachandran, U.
Author_Institution :
Dept. of Mater. Sci. & Eng., Pittsburgh Univ., PA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
Low level doping (/spl les/1 atomic%) of Ag in Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/ was performed via freeze-drying of nitrate solutions. Effects of Ag doping on the c-axis lattice parameter, oxygen content and critical temperature were monitored, Powder-in-tube tapes were fabricated using both Ag-doped and undoped Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/ powders. Tapes were processed using a partial melt heat treatment in flowing oxygen. The effects of Ag doping on the critical current and microstructure were investigated, specifically the Ag-Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/ interface region.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); drying; heat treatment; high-temperature superconductors; lattice constants; powder technology; silver; stoichiometry; strontium compounds; superconducting tapes; superconducting transition temperature; Ag doping; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/:Ag; critical current; critical temperature; freeze-drying; lattice parameter; microstructure; nitrate solution; oxygen content; partial melt heat treatment; powder-in-tube tape; Bismuth; Condition monitoring; Critical current; Doping; Heat treatment; Lattices; Powders; Strontium; Temperature measurement; Temperature sensors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
