Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 19, Issue 3, Pages 3061-3066Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2009.2018213
Keywords
Bi2212/Ag round wire; high-temperature superconductors; superconducting filaments and wires
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In this study, we investigated the effect of filament size on J(e) for high filament count Bi2212 round wire conductors partial melt processed with T-max between 882 and 890 degrees C in pure oxygen. The filament size that produced maximum J(e) was between 12 and 15 mu m depending on conductor design and T-max. When the filament size was below 12 mu m the filaments were unstable during partial melt processing leading to a break-up in the structure of the filament array and low J(e).This effect is attributed the formation of interconnects between filaments which leads to coarsening driven by a reduction in interfacial surface energy.
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