Preparation of High Jc Bi-Sr-Ca-Cu-O Bulk Sample by Floating Zone Method

Bi-Sr-Ca-Cu-O bulk samples with three different nominal compositions of Bi2Sr2CaCu2O y , Bi2Sr2Ca2Cu3O y and Bi0.7Pb0.3SrCaCu1.8O y were prepared by the floating zone method at growth rates ranging from 2 mm/h to 70 mm/h. The sample grown at 2 mm/h with the nominal composition of Bi2Sr2CaCu2O y possessed high density, highly aligned morphology, and a transport critical current density higher than 1490 A/cm2 at 77 K under a zero magnetic field without any postannealing.