The Superconducting Phases in Bi-Sr-Ca-Cu-O and Bi-Pb-Sr-Ca-Cu-O Superconductors at High Temperatures

摘要

The addition Of Pb enhances the hightemperature stability as well as theproportion of the high T_c phase in Bi-Sr-Ca-Cu-O superconductor.The sample A with nominal composi-tion of Bi₁Sr₁Ca₁Cu₂O_Y was synthesized bySolid state reaction.It was sintered in airat 1153K for 24h,followed by annealingat 773K for 24h and furnace-cooling.The sample B with a nominal compositionof Bi₁Pb_0.18Sr₁Ca₁Cu₂O_Y was prepared bymixing PbO with the powder ofBi₁Sr₁Ca₁Cu₂O_Y which had been prefired at1113K for 24h,pressing,sintering