Title :
Effect of precursor phase composition on 2223 phase formation in Ag-sheathed tapes
Author :
Rikel, Mark O. ; Wolf, André ; Arsac, Severine ; Zimmer, Martina ; Bock, Joachim
Author_Institution :
Nexans SuperConductors GmbH, Hurth, Germany
fDate :
6/1/2005 12:00:00 AM
Abstract :
Metastable phase states of BPSCCO 2223 precursor were studied as a function of annealing temperature, time, and oxygen partial pressure. Reproducible, but path-dependent changes in precursor phase composition during annealing are mostly governed by changes in Pb solubility in the (Bi,Pb)2212 phase. Studying phase formation upon heat treatment of tapes made by Nexans customers, we found that BPSCCO phase composition affects melting behavior of (Bi,Pb)2223/Ag tapes, phase recrystallization upon heating, and early stages of Bi2223 phase formation.
Keywords :
X-ray diffraction; X-ray fluorescence analysis; annealing; bismuth compounds; calcium compounds; multifilamentary superconductors; phase equilibrium; powders; pressure; recrystallisation; scanning electron microscopy; silver; solubility; strontium compounds; superconducting tapes; type II superconductors; BPSCCO 2223 precursor; Bi2PbSr2Ca2Cu3O10-Ag; Bi2Sr2CaCu2O8; Nexans customers; annealing temperature; annealing time; heat treatment; lead solubility; melting behavior; metastable phase states; oxygen partial pressure; phase recrystallization; precursor phase composition; silver sheathed tapes; Annealing; Conducting materials; Conductors; Fabrication; Heat treatment; Kinetic theory; Metastasis; Powders; Superconductivity; Temperature; 2223 formation kinetics; BPSCCO precursor; phase equilibria;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.847503
