Abstract
The role of bismuth substitution on phase development and melting behavior of Tl 1.1− x Bi x Ba 0.4Sr 1.6Ca 2Cu 3O 9−δ was studied. The substitution limit was x = 0.25, and low-melting liquid was formed when the limit was exceeded. The barium content of the superconductor decreased with increasing bismuth substitution, which coincided with BaBiO 3 formation. Magnetization and X-ray diffraction data revealed that the single-layer Tl compound coexists with BaBiO 3 up to x = 0.8. For selected compositions, superconductor wire was fabricated by a powder-in-tube process. The critical current density was measured and correlated with the microstructure.
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