Abstract
The superconducting properties of bulk (Bi, Pb)-1212 material are strongly influenced by the chemical starting composition, the employed temperature/time schedule and gas atmosphere. It is shown that via the application of melt texturing (Bi, Pb)-1212 material with improved intragrain and intergrain properties is obtained. The best materials are formed for a Y/Ca ratio of 0.7/0.4 with Bi:Pb:Sr:Y:Ca:Cu = 0.4:0.45:1.9:0.7:0.4:2.25 after application of 1030°C as melting temperature and a cooling rate of 35°C/h to 985°C/12 h. The transition temperature is situated at 94 K with a critical current density j cm = 7.4 × 10 5 Acm −2 (5 K, 0 T) and 2.8 × 10 3 Acm −2 (77 K, 0 T).
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