MATERIAL PROCESSING OF CA Y SUBSTITUTED SINGLE (BI,PB) O-LAYERED-1212/

The superconducting properties of bulk (Bi, Pb)-1212 material are stro ngly influenced by the chemical starting composition, the employed tem perature/time schedule and gas atmosphere. It is shown that via the ap plication of melt texturing (Bi, Pb)-1212 material with improved intra grain and intergrain properties is obtained. The best materials are fo rmed 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 degrees C as melting temperatu re and a cooling rate of 35 degrees C/ h to 985 degrees C/12 h. The tr ansition temperature is situated at 94 K with a critical current densi ty j(cm) = 7.4 x 10(5) Acm(-2) (5 K, 0 T) and 2.8 x 10(3) Acm(-2) (77 K, 0 T).