Superconducting Properties and Microstructures of Pb-Doped Bi2Sr2Ca1Cu2Ox Spherical Particles Prepared by Containerless Solidification and Annealing

The superconducting properties and microstructures of Pb-doped Bi-2212 spherical particles prepared by containerless solidification and subsequent annealing were investigated. After solidification, the spherical particles are present in an amorphous state which can be transformed into the Bi-2212 phase by annealing at temperatures above 800°C. The Pb-doped spherical particles show an improved flux pinning behavior which is considered to arise from the modification of the modulation structure.