Abstract
Abstract BiPbSrCaCuO bulk samples with nominal composition of Bi1.6Pb0.4Sr2Ca3Cu4Oy (2234) were prepared by a melt casting method. The melting process was carried out on two different powders; one consisting of the precursor materials, and one in which the precursor had been calcined. The effects of the melt-casting on the structure, the phase compositions and the superconducting properties have been investigated in as-cast and annealed materials. It was found that the high-Tc superconducting phase can be formed by annealing at 850°C. The annealed (850°C, 200h) sample of 2234 exhibited superconductivity with a Tc(zero) of 105K and a critical current density (77K, zero magnetic field) of 113 A.cm−2.
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