BPSCCO Superconductor with Addition of Ag{sub}2O Synthesized under Electrical Field

摘要

Ag{sub}2O-doped (1.2% wt.) nitrate freeze-dried powders (Bi : Pb : Sr : Ca : Cu = 1.7 : 0.3 : 2 : 2.5 : 3.5) were processed under an external electrical field and 17.5 MPa pressure at 800℃, for 4 min in vacuum. Final heat treatments (HT) were applied at 835-850℃ for 70 h. in air (Bi, Pb){sub}2Sr{sub}2CaCu{sub}2O{sub}x (2212-phase) was formed by electrical field processing in just 4 min. Electrical field application enhanced (Bi, Pb){sub}2Sr{sub}2Ca{sub}2Cu{sub}3O{sub}y (2223-phase) formation during final HT. Ag{sub}2O additions to field sintered BSCCO ceramics increased the amount of 2223-phase and the zero resistance critical temperature (T{sub}(e(R=0))) by ～ 4 k.