Fundamental material aspects underlying the preparation of high-temperature superconducting (Bi,Pb)_2+xSr_2Ca_2Cu_3O_10-x ceramics

摘要

phase equilibria of the quasi-quinary system Bi_3O_3-PbO- SrO-CaO-CuO were studied between 650° and 900 deg C in Air with emphasis on the high-temperature superconduct- Ing phase (Bi,Pb)_2+x Sr_2Ca_2Cu_3O_10+d (2223). The 2223 phase Lies in equilibrium with a number of nonsuperconducting Phases and also with the superconducting phase (Bi, Pb)_2Sr_2- CaCu_2O_8+d (2212). The single-phase region was found to be Very limited.