BiPbSbSrCaCuO的超导电性

SUPERCONDUCTIVITY IN BiPbSbSrCaCuO SYSTEM

据报,在BiPbSrCaCuO中加Sb形成BiPbSbSrCaCuO体系的T_c可达130K。但其组成、结构、性质等均未见详细报道。我们合成了一系列BiPbSbSrCaCuO,发现了一个具有2212相结构、但T_c却为～110K的超导相。 试样制备包括将Bi_2O_3,PbO,Sb_2O_3,SrCO_3,CaO和CuO(AR级)混匀、碾磨。

Incorporating Sb to BiPbSrCaCuO system led to the appearance of a second phase.Besides this impure phase the XRD pattern of the main phase of Bil_6 Pb_(0.4)Sb_(10)Sr_(1.5-2.0)Ca_2Cu_2O_y could be indexed with a tetragonal structure with cell parameters a=0.54 andc=3.06nm, i.e. it corresponds to the low-T_c phase of BiSrCaCuO system,the so called 2212phase.It is of interest to indicate that this phase (with Sb and Pb incorporation) showed aT_c at～110K and Tonset at～120K favorably close to that of the high-T_c phase ofBi(Pb)SrCaCuO system the so called 2223 phase.It is also observed that the c-axis wasincreased from 3.06nm to 3.08nm and T_c was increased as the ignition time waslengthened.