In this study, we investigated the effect of filament size on Jefor high filament count Bi2212 round wire conductors partial melt processed with Tmaxbetween 882 and 890degC in pure oxygen. The filament size that produced maximum Jewas between 12 and 15 mum depending on conductor design and Tmax. When the filament size was below 12 mum the filaments were unstable during partial melt processing leading to a break-up in the structure of the filament array and low Je. 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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Nachtrab et al. (2009) studied this question.
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