Abstract
Decreasing the total lead content from Pb0.4 to Pb0.3 significantly stunts Bi-2223 phase development and greatly reduces the critical current density (Jc) of powder-in-tube tapes made by a two-powder process. This effect can be explained on the basis of the solubility limit for lead in 2212. Pb0.4 samples exceed the solubility limit for lead in 2212, so lead is rejected to create a lead-rich liquid that enhances the kinetics of 2223 formation during heat treatment. By contrast, a liquid does not form in the Pb0.3 sample because its lead content is below the solubility limit. As a result, 2223 formation is much slower and Jc is much lower in the Pb0.3 sample.
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