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

Abstract

Bi-Sr-Ca-Cu-O bulk samples with three different nominal compositions of Bi₂Sr₂CaCu₂O _y , Bi₂Sr₂Ca₂Cu₃O _y and Bi_0.7Pb_0.3SrCaCu_1.8O _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.