Preparation and magnetic properties of Bihyphen;Pbhyphen;Srhyphen;Cahyphen;Cuhyphen;O superconducting ceramics

摘要

A highTcphase (Tcbartil;110 K) in Bihyphen;Pbhyphen;Srhyphen;Cahyphen;Cuhyphen;O systems was synthesized by adding Ca2PbOxto the mixture of a lowTcphase (Tcbartil;80 K) and a Bihyphen;Srhyphen;Cuhyphen;O (Tcbartil;10 K). Xhyphen;ray powder diffraction measurement suggests that the sintered bulk mainly consists of the highTcphase. The volume fraction of the highTcphase was 74percnt; from the measurement of magnetization. The lower critical fieldHc1was 10 Oe at 77.3 K. The critical current densityJcof 3.0times;102A/cm2was obtained for a repressed sample with a highly oriented microstructure.